Chaos Moon
Enchantment
At the beginning of each upkeep, count the number of permanents. If the number is odd, until end of turn, red creatures get +1/+1 and whenever a player taps a Mountain for mana, that player adds an additional 
. If the number is even, until end of turn, red creatures get -1/-1 and if a player taps a Mountain for mana, that Mountain produces colorless mana instead of any other type.
- CMC
- 4
- Mana cost
- Color identity
- R
- Rarity
- rare
- Set
- Ice Age
- Price
- $0.87
- EDHREC rank
- #22303
Chaos Moon swings a global enchantment effect that either neuters your opponents' mana or doubles your red spells' damage, depending on the number of permanents in play — and in Commander, the board state is almost never stable enough for opponents to plan around it. Four mana for a persistent asymmetric effect is the right price when you're building to exploit it.
Format Analysis
Where it lives, where it can’t
| Format | Verdict |
|---|---|
| commander | legal |
| legacy | legal |
| modern | not legal |
| pioneer | not legal |
| standard | not legal |
| vintage | legal |
| pauper | not legal |
| oathbreaker | legal |
Chaos Moon is legal in Commander, Legacy, Vintage, and Oathbreaker, but Commander is where it actually belongs. In Legacy and Vintage the effect is too slow and too dependent on board state to compete with the speed of those formats — four mana and a delayed payoff doesn't match the threat density in either environment. In Commander, the four-player permanent count is almost always in flux, which means Chaos Moon punishes opponents who can't predict when it flips, while a dedicated red deck can engineer the count to stay on the favorable side. Oathbreaker is a viable home for the same reasons as Commander, just at a smaller table.
Key Combos
Combo lines featuring this card
Price Context
Current price
$0.87 bulk tier
At $0.87, Chaos Moon is firmly bulk — low enough that the financial barrier to experimenting with it is essentially zero. The price reflects its narrow appeal rather than weak power; in the right red permanent-count deck it punches well above its cost basis.
Explore
Sources
Mentioned
Updated . Data from Scryfall, EDHREC, and Commander Spellbook.