Mahonri Moriancumer

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.)
All artifacts and sorcery spells cost {1} less to cast during your turn.
When Mohonri Moriancumer is exiled from anywhere you gain 1 life.