Flash
When this enchantment enters, exile target spell.
Your opponents can't cast spells with the same name as the exiled card.
When this enchantment leaves the battlefield, return the exiled card to its owner's hand.
Legalities
tlrnot legal
duellegal
brawllegal
pennylegal
PreDH
Rulings · 5
wotc
If Ashiok's Erasure has exiled an adventurer card, your opponents can't cast spells with the same name as the creature, but may cast their Adventures.
wotc
The exiled spell isn't countered, but it won't resolve. This works against spells that can't be countered.
wotc
If Ashiok's Erasure has exiled a split card, your opponents can't cast a spell with the same name as either half of that card.
Notes
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If Ashiok's Erasure leaves the battlefield before its enters-the-battlefield ability has resolved, its last ability triggers and resolves with no effect, then its enters-the-battlefield ability exiles the target spell for the rest of the game.
wotc
If there is no exiled card (perhaps because the exiled spell was a copy of a spell), or if the exiled card leaves exile somehow, Ashiok's Erasure won't stop players from casting spells.