wotc
You cast the copy while the ability is resolving and still on the stack. You can't wait to cast it later in the turn.
MTG · Card
◇ Catalog #35064
Isochron Scepter
DIGITAL ONLY
prm·#35064·uncommon·foil
Illus. Brian Despain
—
in vault
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for trade
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wishlisted
Jan '13
13 yr ago
Played in EDH
EDHrec rank #712 · Common include
Variants
Gameplay
Artifact
Imprint — When this artifact enters, you may exile an instant card with mana value 2 or less from your hand.
{2}, {T}: You may copy the exiled card. If you do, you may cast the copy without paying its mana cost.
Legalities
tlrlegal
duellegal
brawlnot legal
pennylegal
PreDH
Rulings · 5
wotc
If you don't want to cast the copy, you can choose not to; the copy ceases to exist the next time state-based actions are checked.
wotc
If a spell has {X} in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.
Notes
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Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Brian Despain
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.
SourcesScryfall