Nice. I like the white shifts in particular. Grain Traders is neat, doing something outside of white's slice, but in a way that still feels white-ish and it has cool flavor. Yawgmoth's Whispers is also interesting... I could see that effect in black, and again the flavor is neat.
Simic Investigator 1U
Creature - Vedalken Plant Rogue
2/1
Protection from Black G: Regenerate Simic Investigator.
Dungeon Keeper 1BB
Creature - Human Minion
2/2
When Dungeon Keeper enters play, exile target creature an opponent controls until Dungeon Keeper leaves play.
Avatar of Despair 6BB
Creature - Avatar
5/6
Flying
If an opponent has no cards in hand, Avatar of Despair costs 6 less to cast.
Murmuring Mistfolk 2U
Creature - Illusion
4/3
Whenever Murmuring Mistfolk attacks or blocks, put a -1/-1 counter on it.
When Murmuring Mistfolk is put into a graveyard from play, draw a card for each -1/-1 counter on it.
Night Flight 2B
Sorcery
Target creature gets +3/+3 and gains flying until end of turn.
Metathran Tactician 2U
Creature - Metathran Advisor
1/1
Creatures you control have vigilance as long as Metathran Tactician is enchanted.
Accursed Bite 2G
Enchant Creature
At the beginning of your upkeep, sacrifice a creature.
Enchanted creature gets +3/+3 and has trample.
Enchanted creature is a Werewolf.
Scavenger's Hunt X2G
Sorcery
Exile X target creature cards from your graveyard. For each creature card exiled this way, put a 2/2 green Wolf creature token into play.
Lantern Hound W
Creature - Elemental Hound
1/1
Whenever Lantern Hound attacks, you may pay W. If you do, target creature can’t block this turn.
Angelic Intervention 3WW
Instant
Return all creatures to their owners’ hands.
Spinal Strangler 3B
Creature - Skeleton Warrior
3/2
Whenever Spinal Strangler deals combat damage to a creature, tap that creature and it doesn't untap during its controller's next untap step. 1B: Regenerate Spinal Strangler.
Man-Mountain of Dorn 3RR
Creature - Elemental
2/7 R: Man-Mountain of Dorn gets +1/-2 until end of turn.
Wyvern Hatchling 2R
Creature - Drake
1/1
Flying, First Strike RR: Wyvern Hatchling gets +2/+0 until end of turn. Activate this ability no more than once each turn.
Nostalgia XXG
Sorcery
Discard X cards, then return a card from your graveyard to your hand for each card discarded this way.
Exile Nostalgia.
Wasteland Jackals B
Creature - Hound
2/2
At the beginning of your upkeep, if a player has more life than each other player, the player with the most life gains control of Wasteland Jackals.
Manamutation R
Sorcery
As an additional cost to cast Manamutation, sacrifice a creature.
Add X mana of any one color to your mana pool, where X is one plus the sacrificed creature's converted mana cost. Spend this mana only to cast creature spells.
Gargoyle Sculptor 2W
Creature - Vampire Artificer
2/1
When Gargoyle Sculptor enters play, put a 1/1 colorless Gargoyle artifact creature token with flying into play.
Feralize 1G
Enchant Creature
When Feralize enters the battlefield, draw a card.
Enchanted creature's activated abilities can’t be activated.
Hungry Troglodyte 1GG
Creature - Troglodyte
4/4
When Hungry Troglodyte enters play, sacrifice it unless you discard a creature card.
Rain Blast 2U
Instant
Target player taps four untapped artifacts, creatures, and/or lands he or she controls.
Myriad Rats 4B
Creature - Rat
4/4
Trample
Myriad Rats can’t be blocked by Walls.
Cat Warriors of Nisharn 2G
Creature - Cat Warrior
4/2
Cat Warriors of Nisharn can’t attack if the defending player controls any Islands.
When you control any Islands, sacrifice Cat Warriors of Nisharn.
Invisible Man U
Creature - Human Wizard
1/1
Invisible Man can’t be blocked except by Walls.
Blood of the Traitor BBB
Instant
Whenever damage is dealt to a creature controlled by an opponent this turn, that player loses that much life.
Industrial Revolution 2R
Enchantment
Mountains are no longer basic and have "T, Sacrifice a land: Add 2 to your mana pool." (They are still Mountains and still have "T: Add R to your mana pool.")
Alchemical Breakthrough UBR
Sorcery
Add 6 to your mana pool.
Interchangeable Parts 1U
Enchantment
Tap an untapped artifact you control: Target artifact creature gets +1/+1 until end of turn.
Asmadi's Flame 5
Artifact 1: Target creature you control gets +1/+0 until end of turn. T: Target creature you control gains trample until end of turn.
These are nice!
Breed Infiltrator = Maybe just "attacking creatures you control".
Living Peaks = Since it's legendary, call it "Living Peaks of ______".
Wall of Climbing Vines 2G
Creature - Plant Wall
0/4
Defender
When Wall of Climbing Vines or another Wall enters play under your control, put a +1/+1 counter on each Wall you control.
Nether Shrieker 3B
Creature - Spirit
1/4
When Nether Shrieker enters the battlefield, each opponent loses 1 life for each creature they control.
At the beginning of your upkeep, if Nether Shrieker is the only creature card in your graveyard, you may return Nether Shrieker to the battlefield.
You know I hadn't considered that you could sacrifice the tokens created by Spider Infestation to get more tokens. I think that's still okay, but I'll probably change it to trigger during your upkeep so it's a bit slower.
Love the flavor on this. I agree with the other two posters... Sacrifice rather than destroy seems to fit the flavor better, and I like the idea of it being a sorcery and waiting until end of turn to nix the creature for potential combo fun.
Simic Investigator 1U
Creature - Vedalken Plant Rogue
2/1
Protection from Black
G: Regenerate Simic Investigator.
Dungeon Keeper 1BB
Creature - Human Minion
2/2
When Dungeon Keeper enters play, exile target creature an opponent controls until Dungeon Keeper leaves play.
Avatar of Despair 6BB
Creature - Avatar
5/6
Flying
If an opponent has no cards in hand, Avatar of Despair costs 6 less to cast.
Maybe put a 1/1 saproling into play and gain 2 life for each land?
Murmuring Mistfolk 2U
Creature - Illusion
4/3
Whenever Murmuring Mistfolk attacks or blocks, put a -1/-1 counter on it.
When Murmuring Mistfolk is put into a graveyard from play, draw a card for each -1/-1 counter on it.
Night Flight 2B
Sorcery
Target creature gets +3/+3 and gains flying until end of turn.
Metathran Tactician 2U
Creature - Metathran Advisor
1/1
Creatures you control have vigilance as long as Metathran Tactician is enchanted.
Accursed Bite 2G
Enchant Creature
At the beginning of your upkeep, sacrifice a creature.
Enchanted creature gets +3/+3 and has trample.
Enchanted creature is a Werewolf.
Scavenger's Hunt X2G
Sorcery
Exile X target creature cards from your graveyard. For each creature card exiled this way, put a 2/2 green Wolf creature token into play.
Lantern Hound W
Creature - Elemental Hound
1/1
Whenever Lantern Hound attacks, you may pay W. If you do, target creature can’t block this turn.
Angelic Intervention 3WW
Instant
Return all creatures to their owners’ hands.
Spinal Strangler 3B
Creature - Skeleton Warrior
3/2
Whenever Spinal Strangler deals combat damage to a creature, tap that creature and it doesn't untap during its controller's next untap step.
1B: Regenerate Spinal Strangler.
Man-Mountain of Dorn 3RR
Creature - Elemental
2/7
R: Man-Mountain of Dorn gets +1/-2 until end of turn.
Wyvern Hatchling 2R
Creature - Drake
1/1
Flying, First Strike
RR: Wyvern Hatchling gets +2/+0 until end of turn. Activate this ability no more than once each turn.
Nostalgia XXG
Sorcery
Discard X cards, then return a card from your graveyard to your hand for each card discarded this way.
Exile Nostalgia.
Wasteland Jackals B
Creature - Hound
2/2
At the beginning of your upkeep, if a player has more life than each other player, the player with the most life gains control of Wasteland Jackals.
Manamutation R
Sorcery
As an additional cost to cast Manamutation, sacrifice a creature.
Add X mana of any one color to your mana pool, where X is one plus the sacrificed creature's converted mana cost. Spend this mana only to cast creature spells.
Gargoyle Sculptor 2W
Creature - Vampire Artificer
2/1
When Gargoyle Sculptor enters play, put a 1/1 colorless Gargoyle artifact creature token with flying into play.
Feralize 1G
Enchant Creature
When Feralize enters the battlefield, draw a card.
Enchanted creature's activated abilities can’t be activated.
Hungry Troglodyte 1GG
Creature - Troglodyte
4/4
When Hungry Troglodyte enters play, sacrifice it unless you discard a creature card.
Post some more if you want!
Thank you. New site?
Instant
Target player taps four untapped artifacts, creatures, and/or lands he or she controls.
Myriad Rats 4B
Creature - Rat
4/4
Trample
Myriad Rats can’t be blocked by Walls.
Cat Warriors of Nisharn 2G
Creature - Cat Warrior
4/2
Cat Warriors of Nisharn can’t attack if the defending player controls any Islands.
When you control any Islands, sacrifice Cat Warriors of Nisharn.
Invisible Man U
Creature - Human Wizard
1/1
Invisible Man can’t be blocked except by Walls.
Blood of the Traitor BBB
Instant
Whenever damage is dealt to a creature controlled by an opponent this turn, that player loses that much life.
Industrial Revolution 2R
Enchantment
Mountains are no longer basic and have "T, Sacrifice a land: Add 2 to your mana pool." (They are still Mountains and still have "T: Add R to your mana pool.")
Alchemical Breakthrough UBR
Sorcery
Add 6 to your mana pool.
Interchangeable Parts 1U
Enchantment
Tap an untapped artifact you control: Target artifact creature gets +1/+1 until end of turn.
Asmadi's Flame 5
Artifact
1: Target creature you control gets +1/+0 until end of turn.
T: Target creature you control gains trample until end of turn.
Restless Oread 1R
Creature - Nymph
1/4
Restless Oread attacks if able.
Breed Infiltrator = Maybe just "attacking creatures you control".
Living Peaks = Since it's legendary, call it "Living Peaks of ______".
Creature - Plant Wall
0/4
Defender
When Wall of Climbing Vines or another Wall enters play under your control, put a +1/+1 counter on each Wall you control.
Next: A wall with madness.
Netherborn Phalanx + Nether Spirit
Nether Shrieker 3B
Creature - Spirit
1/4
When Nether Shrieker enters the battlefield, each opponent loses 1 life for each creature they control.
At the beginning of your upkeep, if Nether Shrieker is the only creature card in your graveyard, you may return Nether Shrieker to the battlefield.
EDIT: Ooh, maybe could have forestwalk itself?
Doesn't work if you want it to be mandatory, but for scry it rarely matters.