Biorhythm
Biorhythm: Sorcery, Ninth Edition. Each player's life total becomes the number of creatures they control. Printings, prices, and format legality on Mana Grove.
- Mana cost
- {6}{G}{G}
- Mana value
- 8
- Type
- Sorcery
- Colour identity
- Green (G)
- Rarity
- Rare
- Set
- Ninth Edition (9ED)
- Released
- 2005-07-29
- Collector number
- 231
- Artist
- Ron Spears
- Commander rank
- 10,086 (by how often it appears in Commander decks)
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About Biorhythm
Biorhythm is a Magic: The Gathering card, a rare green sorcery from Ninth Edition (9ED), a core set released in July 2005. It is collector number 231 in that set, with art by Ron Spears. It costs {6}{G}{G} (six generic and two green mana) to cast, for a mana value of 8. Its colour identity is green. It is legal in Modern, Legacy, Vintage, Premodern, Commander, Duel Commander, PreDH and Penny Dreadful. It is banned in Oathbreaker. It has been printed in 3 sets, from Onslaught (2002) to Ninth Edition (2005). The latest aggregated market price for this printing is $24.66 (normal finish, as of 2026-11-01).
Card text
Each player's life total becomes the number of creatures they control.
"I have seen life's purpose, and now it is my own." -Kamahl, druid acolyte
Market price
Latest aggregated market price for the normal finish of this printing: $24.66 (as of 2026-11-01).
The figure covers this printing only; other printings carry their own price on their own page.
Format legality
Legality of Biorhythm by format. Formats in which it is not legal are not listed.
| Modern | Legal |
|---|---|
| Legacy | Legal |
| Vintage | Legal |
| Premodern | Legal |
| Commander | Legal |
| Duel Commander | Legal |
| Oathbreaker | Banned |
| PreDH | Legal |
| Penny Dreadful | Legal |
Other printings of Biorhythm
Biorhythm has been printed in 3 sets. The other printings are listed newest first, with the rarity and release year of each.
| Printing | Rarity | Year |
|---|---|---|
| Secret Lair Countdown (SLC) #58 | Rare | 2026 |
| Ninth Edition (9ED) #231★ | Rare | 2005 |
| Onslaught (ONS) #247 | Rare | 2002 |
Official rulings
Two official rulings apply to Biorhythm, newest first.
- If a player controls no creatures when this resolves, their life total will become zero and they will lose the game.
- This spell causes the player to lose or gain enough life to change to the new life total.
Similar cards
Other sorcery cards with a green colour identity, ranked by how often they appear in Commander decks.
Mentioned in these guides
These guides mention Biorhythm.