Call Da WAAAGH!

Creatures you control get +2/+0 and gain trample until end of turn.
Get stuck in! - If you cast this spell from
exile, those creatures also gain haste until
end of turn.
Rebound (if you cast this spell from your
hand, exile it as it resolves. At the beginning of
your next upkeep, you may cast this card from exile without paying its mana cost.)