Jace and Zndrsplt, Revisioners

Whenever an instant or sorcery card is put into a graveyard from anywhere, you may flip a coin. If
you win, that card gains flashback {2}{r} for as
long as it remains in the graveyard.
You may use the abilites of cards in other
players' graveyards as though they were in your
graveyard. If doing so would move a card to your library or hand, exile that card instead.