What are the official rulings for Jace, Unraveler of Secrets?
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0. If Jace’s emblem’s triggered ability doesn’t counter the first spell an opponent casts (perhaps because that spell can’t be countered), it won’t trigger again in the same turn to try to counter that player’s second spell.
1. If you have multiple opponents, Jace’s emblem can trigger once each turn for each opponent.
2. The emblem’s triggered ability counters the first spell an opponent casts on each turn, not just that opponent’s turn.
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