Mishra's Workshop, of course.

In Vintage and Legacy formats, Mishra's Workshop is widely considered to be one of the strongest lands available, due to its ability to provide a significant boost to a player's mana generation (ramping). By allowing players to generate three colorless mana to cast artifacts with each turn, it enables them to cast powerful artifact spells more quickly than they would otherwise be able to, making it highly prized by competitive players, as some of the strongest spells in Magic are artifacts. Due to this reason, Mishra's Workshop is banned in Legacy.
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