Those can't be correctly labeled. The mat they call "Treachery" is a Red playmat and Treachery is a blue card. They're just guessing names of cards for the mats with no real proof.
While the skeleton has already been identified, the fact that the angel there with the crown is labeled "Treachery" and the water witch is labeled "Siren" may be a lead.
Treachery
Siren
Skeleton Warriors
Just figured I'd share.
http://forums.mtgsalvation.com/showthread.php?t=333582
But yes, Skeleton Warriors is Drudge Skeletons.
http://forums.mtgsalvation.com/showthread.php?t=333582
Skeleton Warrior's is confirmed to be Druge Skeletons if I am correct, and the Siren art we have already saw, but nice to confirm she is U.
The "Treachery card" is not Treachery because Treachery is U and this card is R.
Current post- Grand Prix KC Modern Postmortem (7/7/13)