Demilich

“This spell costs U less to cast for each instant and sorcery you’ve cast this turn. <br>Whenever Demilich attacks, exile up to one target instant or sorcery card from your graveyard. Copy it. You may cast the copy. <br>You may cast Demilich from your graveyard by exiling four instants and/or sorcery cards from your graveyard in addition to paying its other costs.”