Ornulkus, Mind's Betrayal

Flying
Whenever an opponent reveals their hand, you
may exile a card from that player's hand. You
may play that card for as long as it remains exiled.
If a non-land card was exiled this way, you may
spend mana as though it were mana of any color
to cast that card. That player then draws a card.
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"Your thoughts are not your own."