Ajani's Assassin

When Ajani's Assassin enters the battlefield, choose one: target creature gets -2/-2 until end of turn; or exile target creature with converted mana cost 2 or less; or target player loses 2 life and you gain 2 life.
{3}{w}{b}: Target creature has deathtouch and lifelink until end of turn.
I do what Ajani won't.