The legend rule states that, if you control two or more copies of a legendary card with a given name, you must choose one to keep on the battlefield and sacrifice the rest
P/T Number 211 Language Franais Legal Formats Alchemy, Brawl, Commander, Competitive Brawl, Historic, Legacy, Modern, Pioneer, Standard, Timeless, Vintage Rulings (6/6/2025) Each face of a nonmodal double-faced card has its own set of characteristics: name, types, subtypes, abilities, and so on
*This is only a construction with Forbid restrictions at that time
That has always been a problem for Spellslinger decks
Mana Crypt costs zero to cast and immediately generates two mana which recurs every turn, though it has a chance of dealing three damage to you on your upkeep, a downside far outweighed by the absolutely ludicrous upside
Three mainline sets were released, namely Brilliant Stars , Astral Radiance , and Lost Origins