Magmasaur

Creature — Elemental Dinosaur — {3}{R}{R}

This creature enters with five +1/+1 counters on it. At the beginning of your upkeep, you may remove a +1/+1 counter from this creature. If you don't, sacrifice this creature and it deals damage equal to the number of +1/+1 counters on it to each creature without flying and each player.