As long as Omnath, Locus of All remains under your control, you'll retain unspent mana as steps and phases end, although that mana will become black. This means you can add mana and spend it during a future step, phase, or turn. Once Omnath leaves your control, you'll have until the end of the current step or phase to spend the mana before it is lost.
The mana symbols in the card you reveal may be in any combination of colors. For example, you could reveal a card with mana cost {1}{R}{R}{R}, one with mana cost {4}{U}{R}{W}, one with mana cost {W}{U}{B}{R}{G}, or one with mana cost {R/G}{G}{G/W}.
If unspent mana you have has any restrictions or riders associated with it (for example, if it was produced by Omen Hawker), those restrictions or riders remain associated with that mana when it becomes black.
Last observed on Scryfall 2 months ago at $0.51. Over the trailing 90 days the price moved between $0.02 and $0.51 across 97 observations. Cross-checked across TCGplayer, eBay sold, Cardmarket EU, and Star City.
This printing is one of 2 catalogued treatments from MOM — the lineup includes Showcase 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 #313 of *March of the Machine*, the set that shipped alongside the April 2023 March of the Machine release.
Card type: Legendary Creature — Phyrexian Elemental, color identity black/green/red/blue/white, printed at rare. Rares occupy the bottom-of-pack rare slot in standard boosters. Mana cost: {W}{U}{B/P}{R}{G} (5 converted).
Legal across the major constructed formats — Modern, Legacy, Vintage, and Commander — plus Standard rotation play.
EDHrec ranks this card #5,182 in Commander, putting it in the niche-pick tier of the format's playable pool.
Illustrated by Jessica Rossier. Rarix catalogs 5 other cards credited to this artist.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Jessica Rossier
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.
Omnath's last ability isn't a mana ability even though it can cause you to add mana. It uses the stack and can be responded to.
