To Brave or Cower

(Choose one and cast this spell for the chosen ability's mana cost)
Brave {2}{w}{r} - Target creature you control gains +3/+3 and must be blocked by at least four creatures until end of turn. Only that creature can attack this turn.
Cower {b}{b} - Exile target creature. Return it its owner's hand at the end of turn and they lose 2 life.