I want to play a little with Dark Impostor, so blue, with Training Grounds, seemed a natural fit. Most other creatures are here to mess with the opponent when something comes into play or leaves, though the Seizures-Freed from the Real combo could be fun. Realmwright makes a nice pairing with Urborg, Tomb of Yawgmoth, and between them I can have every land in play be both swamps and islands. The 13/11/12/4 curve gives a nice little 2.18 average.