Iruma, Netherworld Infiltrator

When Iruma enters the battlefield, you may
search your library for a Demon creature card
and put it into your hand.
Whenever Iruma deals combat damage to
a player, gain control of target Demon until
Iruma leaves the battlefield. When a Demon
deals damage to Iruma, sacrifice him.
{3}{b}: Iruma gains flying until end of turn.