Old Man of the Sea [Arabian Nights] Aether Revolt Prerelease Promos cast it without paying its

cast it without paying its mana cost

but its power was unmistakable

Set: Ixalan Promos Type: Creature — Merfolk Warrior Rare Cost: {3}{U} Creatures you control with +1/+1 counters on them can't be blocked

" —Ashiok

Old Man of the Sea [Arabian Nights] Aether Revolt Prerelease Promos cast it without paying itsSet: Arabian Nights Type: Creature Djinn Rare Cost: {1}{U}{U} You may choose not to untap Old Man of the Sea during your untap step. {T}: Gain control of target creature with power less than or equal to Old Man of the Sea's power for as long as Old Man of the Sea remains tapped and that creature's power remains less than or equal to Old Man of the Sea's power.