Gutmorn, Pactbound Servant

Flying, Deathtouch
Whenever Gutmorn, Pactbound Servant enters
the battlefield, each player reveals their hand and
discards a nonland card.
Whenever a player discards a card during your
turn, exile that card from their graveyard, then
they choose another player. For as long as that
card remains exiled, the chosen player may play
it, and they may spend mana as though it were
mana of any color to cast it.