Atemsis, All-Seeing
Legendary Creature — Sphinx
Oracle Text
Flying
, 
: Draw two cards, then discard a card.
Whenever Atemsis deals damage to an opponent, you may reveal your hand. If cards with at least six different mana values are revealed this way, that player loses the game.
Rules for this card
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A keyword ability that restricts how a creature may be blocked. See rule 702.9, “Flying.”
Rulings (4)
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Wizards of the CoastEvery Magic card has exactly one mana value. A card with no mana cost has a mana value of 0, and 0 can be one of the six mana values that count toward Atemsis's ability.
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Wizards of the CoastThe mana value of a split card is determined by combining its two halves. For example, the mana value of Fire//Ice in your hand is 4.
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Wizards of the CoastIf a card in your hand has
in its mana cost, the value of X is considered to be 0.
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Wizards of the CoastIf an effect causes you to play with your hand revealed, you can still reveal your hand as Atemsis's last ability resolves. The ability works as normal.