War of the Ants

Whenever this creature is dealt damage, you may create that many 1/1 green Insect creature tokens.

Imprint — , : You may exile an instant or sorcery card with mana value X from your hand. At the beginning of your upkeep, you may copy a card exiled with this artifact. If you do, you may cast the copy without paying its mana cost.

Creatures you control get +1/+1 and have flying and indestructible. At the beginning of your upkeep, sacrifice a creature. If you can't, sacrifice this artifact.

Chain Reaction deals X damage to each creature, where X is the number of creatures on the battlefield.