Chromium, the Mutable [Core Set 2019 Prerelease Promos] Commander's Arsenal if you control the artifact

if you control the artifact with the highest mana value or tied for the highest mana value

Set: Hour of Devastation Type: Enchantment Rarity: Rare Cost: {2}{W} Players can't get counters

Set: Legends Type: Creature — Satyr Rarity: Rare Cost: {2}{G}{G} You may choose not to untap Willow Satyr during your untap step

and the silence of death

the Infinite Gyre is put into a graveyard from anywhere

Chromium, the Mutable [Core Set 2019 Prerelease Promos] Commander's Arsenal if you control the artifactSet: 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.