Powersink Stone (SR14-EN040) [Structure Deck: Fire Kings]

Each time a monster effect is activated, place 1 Spellstone Counter on this card (max. 2). While this card has 2 Spellstone Counters, face-up monsters on the field cannot activate their effects, and their effects are negated. During each End Phase, remove all Spellstone Counters on this card.