Zahar, the Sun’s Servant

Flying, Trample, Hexproof
Vanishing Act {w}{r}{g} ({w}{r}{g}: Exile this creature, then return it to the battlefield at any time. This creature gains haste.)
Whenever a creature enters the battlefield under your control, creatures you control gain +3/+3 and lifelink until end of turn.
Whenever a creature leaves the battlefield, you deal 3 damage to target player.