Lion's Eye Diamond

Artifact, 0 (0)
Sacrifice Lion's Eye Diamond, Discard your hand: Add three mana of any one color to your mana pool. Activate this ability only any time you could cast an instant.¹
Held in the lion's eye - Zhalfirin saying meaning "caught in the moment of crisis"
Illus. Margaret Organ-Kean

Gatherer Card Rulings [Nov 2009]

• 10/4/2004: 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.

Format Legality	Legal in Legacy, MTGO Classic Restricted in Vintage Banned in Extended, Standard
Printings (1/6)	Mirage (Rare)