Ether

Witness (When this card would enter your graveyard from the battlefield instead exile it. As long as this card is exiled, its abilities remain in effect as if
it were on the battlefield. Anytime a Prophet enters the battlefield, this card leaves exile and is put into your graveyard.)
During your turn, all instant spells cast by an opponent costs an additional {1} to cast.
Sacrifice a nonblue permanent: Prevent all damage that would be dealt to
you or creatures you control this turn.