Hellkite Courser (Extended Art) [Commander Legends] SM38 you can substitute this card

you can substitute this card for any 1 "Synchron" Tuner monster

Set: March of the Machine: The Aftermath Type: Legendary Creature — Demon Rarity: Mythic Cost: {2}{R}{G} Flying

Set: Tenth Edition Type: Enchantment Rarity: Rare Cost: {3}{G} Players don't lose unspent mana as steps and phases end

Set: Sword & Shield: Black Star Promos Type: Psychic Rarity: Promo Retreat cost: 0

you can detach 1 Xyz Material from this card instead

Hellkite Courser (Extended Art) [Commander Legends] SM38 you can substitute this cardSet: Commander Legends Type: Creature Dragon Rarity: Mythic Cost: {4}{R}{R} Flying When Hellkite Courser enters the battlefield, you may put a commander you own from the command zone onto the battlefield. It gains haste. Return it to the command zone at the beginning of the next end step.