Ruby and Rowe

Lifelink, Menace
At the beginning of your upkeep Ruby and Rowe
deal damage equal to their power to target
creature you don't control. If a creature dies this
way, exile it with a stone counter on it and put a
+1/+1 counter on Ruby and Rowe. If a player
owns five or more creatures with stone counters
on them, they lose the game.