Sofie, tofu god

All mabel's have indestructible.
When sofie enters the battle field, all creatures get -6/-6. You get 5 tofu counters for each creature still on the battlefield. If you have 15 or more tofu counters, you win the game.
{7}{x}{t}: You get {x} tofu counters
{7}{x}{t}: destroy {x}{x} nonland permanents