Door of Destinies [Commander 2017] Core Set 2019 you may cast the copy

you may cast the copy without paying its mana cost

"You serve Phyrexia

Set: Khans of Tarkir Type: Artifact Rarity: Rare Cost: {1} Whenever another permanent enters the battlefield under your control

"Keep with you only this much: your mount

sacrifice a creature

Door of Destinies [Commander 2017] Core Set 2019 you may cast the copySet: Commander 2017 Type: Artifact Rarity: Rare Cost: {4} As Door of Destinies enters the battlefield, choose a creature type. Whenever you cast a spell of the chosen type, put a charge counter on Door of Destinies. Creatures you control of the chosen type get +1 +1 for each charge counter on Door of Destinies.