Chromium, the Mutable [Core Set 2019 Prerelease Promos] Magic Player Rewards 2008 you may change "swampwalk" to

you may change "swampwalk" to "plainswalk

Set: Arabian Nights Type: Creature — Human Rarity: Uncommon Cost: {W} When Abu Ja'far dies

Set: Amonkhet Invocations Type: Instant Rarity: Mythic Cost: {U} Change the target of target spell with a single target unless that spell's controller pays {2}

Set: Arabian Nights Type: Creature — Djinn Rarity: Rare Cost: {2}{U}{U} Flying

sacrifice a creature

Chromium, the Mutable [Core Set 2019 Prerelease Promos] Magic Player Rewards 2008 you may change "swampwalk" toSet: 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.