The Somnomancer

Flash, Flying

At the beginning of your upkeep you may choose Sleep. If you do, you may not cast spells or attack this turn, and you may cast spells as though they had flash until the start of your next turn.

Whenever you cast a spell during another player's turn, scry 1.

Whenever a creature enters under an opponent's control you may pay {1}. If you do, tap that creature.