Chopper, Rampage

Trample, menace.
Chopper, Rampage attacks each turn if able.
Whenever this card kills a creature, put a
rampage counter on it. For each rampage
counter, creatures you control get +1/+1.
At the start of your upkeep, pay {p/r} for each
rampage counter or remove all rampage
counters and tap Chopper, Rampge.