Vivien's Arkbow 
Text:
, 
, Discard a card: Look at the top X cards of your library. You may put a creature card with mana value X or less from among them onto the battlefield. Put the rest on the bottom of your library in a random order.
Rulings:
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5/3/2019
If a card in your library 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: Legal
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modern: Legal
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legacy: Legal
-
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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duel: Legal
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oldschool: Not legal
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brawl: 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: Not legal
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oathbreaker: Legal
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timeless: Legal
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standardbrawl: Not legal
War of the Spark #181 (rare)
War of the Spark Promos #181s (rare)
