Lion's Eye Diamond
Discard your hand, Sacrifice Lion's Eye Diamond: Add three mana of any one color. Activate this ability only any time you could cast an instant.
Held in the lion's eye
—Zhalfirin saying meaning "caught in the moment of crisis"
Lion's Eye Diamond is on the Reserved List.
Collector Number: 272
2004-10-04 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.
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