Only mana produced by abilities that caused you to lose life may be spent to cast spells this way
The card was originally printed as a special birthday gift for company employees
It was sacrificed nearly 100% of the times it was put into play
They facilitate an easier access to Tribute Summon "Darklord Morningstar", which has an on-Tribute Summon effect to potentially Special Summon a large horde of "Darklord" monsters from the Deck, then potentially mill several "Darklord" cards for LP recursion, for "Darklord" monsters to copy their effects or revive said monsters
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