Ratchet Bomb 
Text:
: Put a charge counter on Ratchet Bomb., Sacrifice Ratchet Bomb: Destroy each nonland permanent with converted mana cost equal to the number of charge counters on Ratchet Bomb.
Rulings:
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8/7/2020
Tokens that aren’t a copy of something else don’t have a mana cost. Anything without a mana cost normally has a converted mana cost of 0.
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8/7/2020
If a permanent has <img src="/Handlers/Image.ashx?size=small&name=X&type=symbol" alt="Variable Colorless" align="absbottom" /> in its mana cost, X is considered to be 0.
Legality:
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standard: Not legal
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future: Not legal
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frontier: Not legal
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modern: Legal
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legacy: Legal
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pauper: Not legal
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vintage: Legal
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penny: Legal
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commander: Legal
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1v1: Legal
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duel: Legal
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brawl: Not legal
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oldschool: Not legal
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historic: Legal
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pioneer: Legal
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gladiator: Legal
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premodern: Not legal
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historicbrawl: Legal
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paupercommander: Not legal
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alchemy: Not legal
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explorer: Legal
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predh: Legal
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oathbreaker: Legal
Other languages:
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Ratchet Bomb
Magic Online Promos #49836 (rare)
Magic 2014 #215 (rare)
Magic 2014 Promos #*215 (rare)
Scars of Mirrodin #196 (rare)
Historic Anthology 3 #RB (rare)
Double Masters #284 (rare)
