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Counterbalance allows you to reveal the top card of your library whenever a spell is played, and counter it if the revealed card has the same mana cost.
If an opponent has cast several spells to ramp up to casting Tendrils of Agony, and I have Helm of Obedience on top of my library, do I get to counter all of the storm copies?
No, Counterbalance only counters the original Storm spell.
706.10. To copy a spell or activated ability means to put a copy of it onto the stack; a copy of a spell isn’t cast and a copy of an activated ability isn’t activated. [...]
Since the copies are not cast, Counterbalance never triggers for them.
