Aghyt, Calamity Incarnate

Flying

At the beginning of each player's upkeep, that
player draws a card. Then, they reveal a nonland
card from their hand and may pay its mana cost. If
they do, they keep it and take damage equal to its converted mana cost. If they don't, exile it. You
may cast cards exiled this way during your turn by
spending life equal to its mana value.

Here lies the end of all prophecies