Mar

Indestructible
Curse — When Mar enters the battlefield, target opponent gains control of it and is cursed: they
can't attack or block with it. Cursed opponent
loses 1 life whenever a card is drawn from their library or discarded from their hand as long as
Mar is under their control. For each life lost this
way, you gain 1 life. Opponent may pay 4 life or {4} to return Mar to the battlefield under its
original controller's control. This can only be
paid during cursed opponent's end step.