MAGIC: THE GATHERING
Sacrifice Lion's Eye Diamond, Discard your hand: Add three mana of any one color. Activate this ability only any time you could cast an instant.
Lion's Eye Diamond does a pretty good imitation of the most powerful card in Magic - Black Lotus. The discard "drawback" even works in favor of many of the decks that run Lion's Eye Diamond, like Dredge, which wants to put its hand in the graveyard immediately, or Storm, which wants to empty its hand for Infernal Tutor.