Yoktuzo, Prodigy of Motmot

Whenever Yoktuzo attacks put a +1/+1 counter on it, then if it has 3 or more +1/+1
counters on it untap it, remove it from
combat, then transform it.
"Don't think yourself wise for defeating those
older than you, rats are nimble and small but
their brains are no less tiny" - Kot, Maku Elder