Vexxar, the Mindbrander

Haste, Lifelink
Whenever a creature would leave your control you may have Vexxar, the Mindbrand deal 2 damage to target creature or player, sacrifice that creature.
{u}{b}{r}{t}: Gain control of target creature until the end of turn, it gets +1/+0, trample, and haste as long as you control it. Untap it.