Common Curve Filler 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
During deckbuilding, choose a number from one to nine. Write that number in this card's mana cost, power, and toughness.
Complete guide
Common Curve Filler is a unique Shapeshifter that adapts to your specific deckbuilding needs before the match even begins. By allowing you to choose its mana cost, power, and toughness, it provides unparalleled flexibility for filling gaps in your mana curve. This card effectively becomes whatever size you need, ranging from a tiny utility creature to a massive late-game threat.
Defining the Creature
The primary function of Common Curve Filler occurs during the deckbuilding stage. You must choose a single whole number between one and nine and record it directly on the card. This number defines three distinct characteristics: the mana cost (which also determines the converted mana cost/mana value), the power, and the toughness. Once chosen, these values are fixed for the duration of your games.
Step-by-Step Resolution
When you cast Common Curve Filler, you pay the mana cost you assigned to it during deckbuilding. It enters the battlefield as a creature with the power and toughness you wrote down. It does not enter with counters; its base stats are simply equal to that chosen number. If you chose five, it is a 5/5 creature for five mana.
Common Mistakes
A frequent error is trying to choose different numbers for each attribute. You cannot make it a 9/9 for one mana; the single chosen number applies to all three fields equally. Additionally, this choice cannot be changed once the game has started. You must decide on the number when you add the card to your deck list or physical deck box.
Strategic Implementation
This card is best used to fix 'dead spots' in your mana curve. If your deck has too many two-drops and four-drops, you can set Common Curve Filler to three to ensure you have a proactive play on the third turn. Because it is a Shapeshifter, it also benefits from any tribal synergies your deck might include.
Interaction examples
If you choose the number one for Common Curve Filler, it becomes a 1/1 for one mana. While Ornithopter is a 0/2 for zero mana, the Filler provides a more aggressive body at the cost of one mana, demonstrating how it can be tuned to be slightly more impactful than standard zero-cost utility creatures if your deck requires early board presence.
In a scenario where you have plenty of early plays like Walking Ballista but lack a dedicated finisher, you might set Common Curve Filler to nine. This results in a 9/9 creature for nine mana. Unlike Walking Ballista, which requires mana to grow, the Filler provides a massive, static body immediately upon resolution, though it lacks the versatility of the Ballista's activated abilities.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Common Curve Filler
Original English text — Wizards of the Coast / Scryfall
No additional ruling has been published for this card.
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Meta decks with Common Curve Filler
No archived Top 8 deck with this card yet.



Ornithopter
Walking Ballista