Nefarox, Grixis Warlord

Flying, First Strike
Whenever a creature is dealt damage by a creature
you control, tap it and gain control of it until
Nefarox, Grixis Warlord leaves the battlefield. It
doesn't untap during your untap step.
{u}{b}{r}: deal 3 damage to target creature you
control. Untap it. It gets +3/+0 until end of turn.