Wish for Peace

Praise (You may begin the game with this card from outside the game in your command zone, if all players agree.)
All creatures have "{t}: You get X wish counters, where X is this creature's toughness. Each other player may put a -1/+1 counter on a creature he or she controls. At the beginning of your next end step, if you have 50 or more wish counters, you win the game."