(As a Siege enters, choose an opponent to protect it. You and others can attack it. When it's defeated, exile it, then cast it transformed.)

When Pewter City Gym enters the battlefield or is dealt damage, target creature gets +1/+1 until end of turn.

At the beginning of your upkeep, target creature you control gets +X/+X until end of turn, where X is the number of Badges you control.