The Toymaker, Wily Gambler

Whenever Wily Gambler attacks, choose a
card in your hand. Defending player guesses
whether that card’s mana value is greater than
the number of artifacts you control. If they
guessed wrong, you may cast it without paying
its mana cost. Otherwise, investigate.
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,,I came to this universe with such delight. I have
toyed with supernovas and turned galaxies into
spinning tops. I gambled with God and made him a
Jack-in-the-box."