Mist Mage

Channel 1 — Put one +1/+1 counter on
Mist Mage when it enters the battlefield
If Mist Mage has +1/+1 counters, it cannot
be blocked.
{t} Remove a +1/+1 counter from Mist Mage: Creatures you control with +1/+1 counters
can't be blocked this turn.