Cannonball Sling

Shield trigger (When this spell is put into your hand from your shield zone, you may cast it immediately for no cost.) Destroy one of your opponent's creatures that has power 2000 or less. Metamorph (If you have 7 or more cards in your mana zone, this spell gets the following Metamorph ability.) $metamorph Instead of a creature that has power 2000 or less, destroy one of your opponent's creatures that has power 6000 or less.