Chromium, the Mutable is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.
Official card text
Flash This spell can't be countered. Flying Discard a card: Until end of turn, Chromium becomes a Human with base power and toughness 1/1, loses all abilities, and gains hexproof. It can't be blocked this turn.
Complete guide
Chromium, the Mutable is a powerful Elder Dragon that dominates the skies with its massive 7/7 frame and evasive abilities. As a cornerstone of control strategies, it offers unparalleled protection and the unique ability to shapeshift into an elusive Human. This legendary creature is designed to finish games while remaining virtually untouchable by traditional removal.
What it Does
Chromium, the Mutable is a Flash creature that cannot be countered, making it a reliable threat against other blue decks. While it is naturally a 7/7 Flier, you can discard a card at any time to transform it into a 1/1 Human. In this form, it loses its other abilities but gains Hexproof and becomes unblockable for the rest of the turn.
Resolving the Transformation
When you activate the discard ability, the effect creates a new set of characteristics for Chromium. First, its base power and toughness become 1/1, overwriting any previous base P/T setting effects. Second, it loses all current abilities, including Flying and the discard ability itself. Finally, it gains Hexproof and the 'can't be blocked' status until the end of the turn.
Common Mistakes
A frequent error is trying to make Chromium unblockable after it has already been declared as blocked by an opponent; this will not remove the blocker. Additionally, players often forget that losing all abilities means Chromium loses the very ability that allowed it to transform, meaning you cannot activate the discard ability multiple times in a row to 'stack' the effect if it is already a Human.
When to Play It
Chromium is best played at the end of your opponent's turn using Flash to avoid board wipes. Once on the field, keep at least one card in hand to protect it. If an opponent targets it with a spell, respond by discarding a card to grant it Hexproof, effectively fizzling their spell.
Interaction examples
Hullbreaker HorrorIf your opponent has Hullbreaker Horror on the battlefield and you cast Chromium, the Mutable, they cannot counter the spell. However, they could normally try to return the spell to your hand. Because Chromium 'can't be countered', it safely enters the battlefield regardless of most stack interaction. Once on the field, if they use the Horror to bounce Chromium, you can discard a card to give it Hexproof, making it an illegal target.
Sun TitanWhen you discard a small permanent card like a land or a low-cost artifact to activate Chromium's ability, you move that card to the graveyard. If you then attack with Sun Titan, you can return that discarded card directly to the battlefield. This allows you to fuel Chromium's protection while maintaining card parity or advantage.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Chromium, the Mutable
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
Chromium stops being an Elder Dragon for the turn once its last ability has resolved. It's still a legendary creature named Chromium, the Mutable.
No other card is named in this ruling.
- #2· Wizards of the Coast
Chromium's activated ability overwrites all previous effects that set its base power and toughness to specific values. Any power- or toughness-setting effects that start to apply after that ability resolves will overwrite this effect.
No other card is named in this ruling.
- #3· Wizards of the Coast
Effects that raise or lower a creature's power and/or toughness, such as the effect of Titanic Growth, will apply to the creature no matter when they started to take effect. The same is true for any counters that change its power and/or toughness and effects that switch its power and toughness.
No other card is named in this ruling.
- #4· Wizards of the Coast
If Chromium gains an ability after its activated ability resolves, it will keep that ability.
No other card is named in this ruling.
- #5· Wizards of the Coast
Activating Chromium's last ability after it has become blocked won't cause Chromium to become unblocked.
No other card is named in this ruling.
Legal formats
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