Pack of Raptors

Ambush {1}{g} ( You may cast this card for its ambush cost as though it had flash as long as a creature is attacking you. If you do, this creature blocks that creature if able this turn.) If you paid for Pack of Raptors Ambush cost, Pack of Raptors gains +0+2 and all green creatures cost {g} less to cast until end of turn.
DO NOT underestimate velociraptors.