You can keep unspent green mana indefinitely while Omnath is on the battlefield. That means if you add a green mana during one step or phase, you can spend it during a later step or phase, or even a later turn. Other types of mana will be lost as normal as each step and phase ends.
If a green mana you produce has certain restrictions or riders associated with it (for example, if it was produced by Ancient Ziggurat), they'll apply to that mana no matter when you spend it.
Once Omnath leaves the battlefield, you have until the end of the current step or phase to spend your unspent green mana before it too is lost as normal. There is no penalty associated with this other than the loss of the mana.
Last observed on Scryfall 2 months ago at $31.30. Over the trailing 90 days the price moved between $0.02 and $31.30 across 52 observations. Cross-checked across TCGplayer, eBay sold, Cardmarket EU, and Star City.
This printing is one of 3 catalogued treatments from WWK — the lineup includes Foil and Nonfoil alongside the standard finish. Across our catalog the Rarix library tracks every variant in the same family so collectors can compare price, scarcity and demand inside a single lineage.
Card #109 of *Worldwake*, the set that shipped alongside the February 2010 Worldwake release.
Card type: Legendary Creature — Elemental, color identity green, printed at mythic. Mythic rares historically land in roughly one out of every eight boosters at standard print densities. Mana cost: {2}{G} (3 converted).
Legal in Modern, Legacy, Vintage, and Commander.
EDHrec ranks this card #3,572 in Commander, putting it in the niche-pick tier of the format's playable pool.
Illustrated by Mike Bierek. Rarix catalogs 458 other cards credited to this artist.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Mike Bierek
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.
