Chromium, the Mutable [Core Set 2019 Prerelease Promos] Onslaught these slivers have proven unruly—they

these slivers have proven unruly—they know they cannot be caught

Target player reveals their hand and discards all cards with that name

At the beginning of the upkeep of enchanted enchantment's controller

Whenever an opponent taps a land for mana

damp air of the dead earth in a steady rhythm

Chromium, the Mutable [Core Set 2019 Prerelease Promos] Onslaught these slivers have proven unruly—theySet: 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.