Learned Knight

{x}{u}: Reveal the top X cards of your library. You
may cast an instant or sorcery spell with
converted mana cost X of less from among them
without paying it's mana cost. You may choose
whether or not to pay any additional costs.
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The knight-scholars of the early Mage Legion earned
respect in Elmonvere and beyond as riddlers, sorcerers,
and knights-errant.