![Chromium, the Mutable [Core Set 2019 Prerelease Promos] 1HP262 Set: HeartGold & SoulSilver: Base](https://cdn.shopify.com/s/files/1/0688/0863/8776/files/11496802-ce30-4506-9311-f6ae42e0753b.png?v=1762970276)
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Set: HeartGold & SoulSilver: Base Set Type: Grass Rarity: Rare Retreat cost: Colorless
Set: McDonald's Promos: 2018 Collection Type: Lightning Rarity: Promo Retreat cost: Colorless
• 1 Jwar Isle Refuge
• 1 Song of the Dryads
Set: Sun & Moon: Black Star Promos Type: Water Rarity: Black Star Promo Retreat cost: Colorless
Chromium, the Mutable [Core Set 2019 Prerelease Promos] 1HP262 Set: HeartGold & SoulSilver: BaseSet: Core Set 2019 Prerelease Promos Type: Legendary Creature Elder Dragon Rarity: Mythic Cost: {4}{W}{U}{B} Flash This spell can't be countered. Flying Discard a card: Until end of turn, Chromium, the Mutable becomes a Human with base power and toughness 1 1, loses all abilities, and gains hexproof. It can't be blocked this turn.