Sawtooth Thrasher

Menace, Trample
Sawtooth Thrasher enters the battlefield with 2 +1/+1 counters on it.
Remove 2 +1/+1 counters from Sawtooth Thrasher: Sawtooth Thrasher gets +4/+4 until end of turn.
We know it has at least 47 teeth because that is the most that were recovered from a single carcass. Zendikar field guide pg. 421