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.
1. Amano-Iwato deck is dead.
2. This card is too slow and lacks protection for it to work, not to mention using a specific type of counter that has no real support whatsoever.
It would take work, but an artifact deck might be able to use this, since artifacts only activate on the opponent's turn anyways. If you can activate your artifacts at the beginning of your opponent's turn, you prevent them from doing anything the rest of the turn except set cards. Not sure what to do from that point.