You create and cast the copies all during the resolution of Mnemonic Deluge. You can't wait and cast them later. If you don't cast all three copies, the ones you don't cast will cease to exist.
MTG · Card
◇ Catalog #82
Mnemonic Deluge
cmr·#82·mythic·nonfoil
Illus. Chris Rallis
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in vault
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for trade
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wishlisted
Nov '20
5 yr ago
Value
$7.66$1 (-7.9%)
30 days high $8.08 · low $6.62
Volatility · moderate
EUR€9.29USD$6.66TIX13.21 tix
Where to buy / sell
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Played in EDH
EDHrec rank #3,838 · Niche pick
Variants
Gameplay
Sorcery
Exile target instant or sorcery card from a graveyard. Copy that card three times. You may cast the copies without paying their mana costs. Exile Mnemonic Deluge.
Past, present, and future surged through the wizard's mind, bringing a flood of possibilities.
Legalities
tlrnot legal
duellegal
brawlnot legal
pennynot legal
PreDHnot legal
Rulings · 4
wotc
wotc
Because you're casting the spells during the resolution of Mnemonic Deluge, ignore any timing restrictions based on card type. In other words, you can cast copies of a sorcery card this way.
wotc
If you cast a spell "without paying its mana cost," you can't choose to cast it for any alternative costs. You can, however, pay additional costs. If the card has any mandatory additional costs, you must pay those to cast it.
Notes
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Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Chris Rallis
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.
