Magmasaur

Magmasaur comes into play with five +1/+1 counters on it.
At the beginning of your upkeep, sacrifice Magmasaur unless you remove a +1/+1 counter from it. If you sacrifice Magmasaur this way, it deals damage equal to the number of +1/+1 counters on it to each creature without flying (This creature can't be blocked except by creatures with flying.) and each player.