Each time a monster effect is activated, place 1 Spellstone Counter on this card when that effect resolves (max. 2). While this card has 2 Spellstone Counters, neither player can activate the effects of face-up monsters on the field, also the effects of face-up monsters on the field are negated. Once per turn, during the End Phase, if this card has any Spellstone Counters: Remove them.