Blacephalon (SM221) [Sun & Moon: Black Star Promos] Phyrexian Horror Warden of the Tower: Creatures

Warden of the Tower: Creatures you control gain indestructible until end of turn

cards in your cost area) : Set up to 1 of your "Supernova" or "Straw Hat Crew" type Character cards with a cost of 5 or less as active

Set: Secret Lair Drop Series Type: Legendary Creature — Human Advisor Rarity: Rare Cost: {2}{W}{B} If a creature dying causes a triggered ability of a permanent you control to trigger

this Character gains [Double Attack] during this turn

But according to my calculations

Blacephalon (SM221) [Sun & Moon: Black Star Promos] Phyrexian Horror Warden of the Tower: CreaturesSet: Sun & Moon: Black Star Promos Type: Psychic Rarity: Black Star Promo Retreat cost: Colorless,Colorless