Dremaz, The Abysal Throne

Flying, deathtouch
You can't gain life.
Whenever Dremaz enters the battlefield, gain
control of target creature an opponent controls.
It gains "culmilative upkeep - pay 1 life."
Replace all instances of "you control" with "you
don't control" and all instances of "+" with "-" in
creatures you own but don't control.