Naya Delirium is a low-curve creature deck (Patchwork Beastie, Wildfire Wickerfolk, Fear of Missing Out) that wants to fill its graveyard and go wide, so Day of Black Sun at X=2 sweeps the board and strips abilities like Fear of Missing Out's extra combat trigger before it matters. Qarsi Revenant's flying, deathtouch, lifelink body trades up against or blocks profitably almost anything they can put on the ground. We Say Thee Nay! is weak against a creature-heavy, low-noncreature-spell list, and Multiversal Passage's tempo cost isn't worth it against this aggressive curve.