Bort's Gambit

Target opponent reveals their hand. Choose a
nonland card from it and exile it.
At the beginning of your next upkeep, you may
cast the exiled spell by paying life equivalent to
it's converted mana cost.
"Crumbs for the curious, whispers for the wary,
Trust a beggar's words, or your path could get scary."
—Bort the Beggar