Phenax, God of Deception

Phenax, God of Deception {3}{U}{B}

Legendary Enchantment Creature - God | Power/Toughness: 4 / 7 (CMC 5)
As long as your devotion to blue and black is less than seven, Phenax isn't a creature.
Creatures you control have "{T}: Target player puts the top X cards of their library into their graveyard, where X is this creature's toughness."