![Chromium, the Mutable [Core Set 2019 Prerelease Promos]](https://www.cardgamebestonline.com/wp-content/uploads/2026/07/chromium-mutable-core-set-2019-prerelease-promos.webp)
Description
| Set: | 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.
![Verduran Enchantress [Revised Edition]](https://www.cardgamebestonline.com/wp-content/uploads/2026/07/verduran-enchantress-revised-edition.webp)
![Star of Extinction [Ixalan Prerelease Promos]](https://www.cardgamebestonline.com/wp-content/uploads/2026/07/star-extinction-ixalan-prerelease-promos.webp)
![Olivia, Mobilized for War [Shadows over Innistrad Prerelease Promos]](https://www.cardgamebestonline.com/wp-content/uploads/2026/07/olivia-mobilized-war-shadows-over-innistrad-prerelease-promos.webp)
![Jackal Pup [Tempest]](https://www.cardgamebestonline.com/wp-content/uploads/2026/07/jackal-pup-tempest.webp)
![Forest (1) [European Land Program]](https://www.cardgamebestonline.com/wp-content/uploads/2026/07/forest-1-european-land-program.webp)
![Yule Ooze [Happy Holidays]](https://www.cardgamebestonline.com/wp-content/uploads/2026/07/yule-ooze-happy-holidays.webp)
![Swords to Plowshares [Ice Age]](https://www.cardgamebestonline.com/wp-content/uploads/2026/07/swords-to-plowshares-ice-age.webp)
![Spell Snare [Dissension]](https://www.cardgamebestonline.com/wp-content/uploads/2026/07/spell-snare-dissension.webp)