Foster, Thee Banger

Castcade, Flying, Haste.
You may exert Foster, Thee Banger as it attacks.
When you do, it deals 3 damage to target
creature an opponent controls.
If Foster, Thee Banger started the turn exerted:
exile target card from a graveyard. If it was a
land card, add {r} or {g}. Otherwise, you gain
3 life and deals 3 damage to each opponent.
He came, He banged and He conquered.