Crooked Scales 
Text:
,
: Flip a coin. If you win the flip, destroy target creature an opponent controls. If you lose the flip, destroy target creature you control unless you pay
and repeat this process.
Rulings:
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10/4/2004
If you pay the <img src="/Handlers/Image.ashx?size=small&name=3&type=symbol" alt="3" align="absbottom" />, you do not choose a new pair of targets when it repeats. This means that if you lose the flip, you have the choice of having your creature destroyed or paying <img src="/Handlers/Image.ashx?size=small&name=3&type=symbol" alt="3" align="absbottom" /> to try again to win the flip. If you lose again, you get the same choice, and so on. You can keep trying to destroy your opponent’s creature as long as you have mana to pay.
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10/4/2004
You choose both targets on activation, so you can only activate this when you can legally choose both targets.
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: Not 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: Not 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: Not legal
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pioneer: Not legal
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gladiator: Not legal
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premodern: Legal
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historicbrawl: Not legal
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paupercommander: Not legal
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alchemy: Not legal
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explorer: Not legal
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predh: Legal
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oathbreaker: Legal