Nunu & Willump, Inseparable

Trample, Endure 1 (At the beginning of your end
step, if a source an opponent controlled dealt damage
to this creature this turn, put a +1/+1 counter on it.)
Whenever Nunu & Willump, Inseparable attack,
you may remove any number of +1/+1 counters
from it. If you do, it deals that much damage to defending player and you draw that many cards.
"Every adventure is better with a friend!"