Rocksteady, Mutant Marauder (Borderless) (Surge Foil) [Teenage Mutant Ninja Turtles Commander]

Partner with Bebop, Skull & Crossbones (When this creature enters, target player may put Bebop into their hand from their library, then shuffle.)
Trample
Whenever another nontoken creature you control enters, put a +1/+1 counter on target creature.