Lissandra The Ice Witch

Whenever any enemy creature dies, you create a 1/1 Frozen Thrall token under your control with Decay. They must attack when able.

{t}{u/b}{4} If the player paid {u} then Lissandra gains Hexproof and Indestructible until your end step. If the player paid {b}, target enemy creature gains one stun counter, and the creature has its power set to 0 so long as the stun counter remains.