A-Core Catapult

A-Core Catapult gets a vengeance counter for
each creature on the battlefield.
At the beginning of upkeep choose 1
•{g}{t}: Create X 1/1 A-Core creature token,
where X is the number of vengeance counters on
A-Core Catapult.
•{b}{t}: Deal x amount of damage to an opponent
that attacked you this round.