wotc
The ability is a mana ability, so it is activated and resolves as a mana ability, but it can only be activated at times when you can cast an instant. Yes, this is a bit weird.
MTG · Card
◇ Catalog #307
Lion's Eye Diamond
mir·#307·rare·nonfoil
Illus. Margaret Organ-Kean
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in vault
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for trade
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wishlisted
Oct 1996
30 yr ago
Value
$761.24+$49 (+6.8%)
30 days high $761 · low $713
Volatility · moderate
EUR€401.65USD$761.24TIX14.88 tix
Where to buy / sell
Search links · prices vary by venue
Buy this card
Played in EDH
EDHrec rank #728 · Common include
Variants
Gameplay
Artifact
Discard your hand, Sacrifice this artifact: Add three mana of any one color. Activate only as an instant.
Held in the lion's eye
—Zhalfirin saying meaning "caught in the moment of crisis"
Legalities
tlrbanned
duelbanned
brawlnot legal
pennynot legal
PreDHlegal
Rulings · 1
Notes
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Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Margaret Organ-Kean
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.