Splinter of the Shadows - Ashcoat of the Shadow Swarm (Borderless) (PZA-006) - Teenage Mutant Ninja Turtles Eternal-Legal

Whenever Splinter attacks or blocks, other Rats you control get +X/+X until end of turn, where X is the number of Rats you control.

At the beginning of your end step, you may mill four cards. If you do, return up to two Rat creature cards from your graveyard to your hand.