Screaming Bell

Screaming bell enter the battlefield with a Pest counter on it.
{b}{g} : Up to each of up to X target creatures an opponent control gain -X/-X until the end of the turn where X is the number of Pest counter on Screaming Bell. If a creature targetted by this effect die this turn, put a Pest counter on Screaming Bell. This effect cost {1} more to activate for each Pest counter on Screaming Bell.