public override bool CheckState(Game game)
{
return
(!game.AbilitiesOnStack().Contains(this) && // Don't put this on the stack if it's already on the stack
Source.Controller.Battlefield.Contains(Source) && // Don't put this on the stack if Dark Depths is no longer on the battlefield
Source.Counters.Count(c => c == CounterType.Ice) == 0); // Don't put this on the stack if Dark Depths still has ice counters
}