Shadow Rider Calyrex VMAX (075/198) [Sword & Shield: Chilling Reign] SPA Estudiante de Sakashima You may spend mana as

You may spend mana as though it were mana of any color to cast creature spells with converted mana cost equal to the chosen number

or enchanted by anything white

Set: Worldwake Type: Creature — Human Warrior Ally Common Cost: {1}{B} Bojuka Brigand can't block

Set: Zendikar Rising Commander Type: Land Rarity: Rare Needle Spires enters the battlefield tapped

where X is the number of words in that spell's name

Shadow Rider Calyrex VMAX (075/198) [Sword & Shield: Chilling Reign] SPA Estudiante de Sakashima You may spend mana asSet: Sword & Shield: Chilling Reign Type: Psychic Rarity: Ultra Rare Retreat cost: Colorless,Colorless