Enya the Hag

Whenever Enya the Hag deals damage to a
creature an opponent controls, if that creature
dies, you gain control of it instead. Otherwise, tap
that creature. It doesn't untap until your next
turn. When Enya the Hag leaves the battlefield,
return all creatures you gained control of through
Enya the Hag back to their owner's graveyard.
{t}: Return target creature from your graveyard to
the battlefield. It gains haste. At the beginning of
your next upkeep, exile that creature.