Amicus Nex, Insane King

Deathtouch
Dominate
(When Amicus Nex enters the battlefield, gain control
of target creature an opponent controls until end of turn.
Untap it and it gains haste until end of turn.)
Whenever you gain control of a creature you don't
own, that creature gains Insanity.
(A creature with Insanity has "At the beginning of your upkeep, this creature deals 1 damage to you and you discard a card at random.")