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This card doesnt necessarily warp formats or break the game, but it has that sort of all-around versatility that makes it such a staple in many formats

Boros Charm: the best charm in Return to Ravnica block

P/T Number 225 Language English Legal Formats Brawl, Commander, Competitive Brawl, Historic, Legacy, Modern, Pioneer, Timeless, Vintage Not Legal Formats Alchemy, Pauper, Standard Rulings (4/17/2020) If a card in a player's deck or a permanent on the battlefield has in its mana cost, X is considered to be 0

His Red/Purple Leader edition was so strong it warped the whole Eastern OP-08 metagame until it was shelved