Where are the missing red/blue dual lands?

[FireFox31]

While reviewing dual lands, I see a pattern that a single mechanic is repeated for all 10 color combinations. However, there are some Red/Blue dual lands missing from the pattern.

As Steam Vents corresponds to Blood Crypt, are there any Blue/Red lands which correspond (have the same mechanics) as Shadowblood Ridge, Tresserhorn Sinks, Urborg Volcano? I'm playing Black/Blue/Red, so trying to evaluate all my options.

Thanks.

[MajoraX]

Blue and red are 'enemy' colors, while black and red are 'allied' colors.
Lots of times when making a cycle of lands, Wizards will only make allied color lands in order to show off flavorful and mechanical design.

I recommend...Cascade Bluffs?

[Ejdeha]

What MajoraX said. To tell if two colors are enemy or allied just look at the color wheel on the back of a magic card. If the two colors are next to each other, they are allied. If they are across from each other, they are enemy.

[FireFox31]

Interesting, thanks. Wow, Dr. Garfield and the gang really didn't miss a thing.

If anyone's interested, the three Blue/Red dual lands I've found are:
Steam Vents
Cascade Bluffs
Shivan Reef
There are others with phasing and counters, but those are lame. Izzet Signet works too, but costs.

[Ejdeha]

I am a fan of Izzet Boilerworks in certain decks. Also a fan of the signets, again in certain decks. Ravnica really did have some awesome mana fixing.

[heroicraptor]

Volcanic Island is pretty sweet.

[KPDaly16]

You could also go beyond 2 color lands:

Crumbling Necropolis
City of Brass
Reflecting Pool
Forbidden Orchard

And so on.

[Weeksy]

http://magiccards.info/query/cards/4379851.html


Almost all of those should be U/R duals. It's a list of all the lands with the symbol and the symbol on their text box.