Legendary Creature — Elemental

Omnath, Locus of Mana

Omnath, Locus of Mana trading card

Legendary Creature — Elemental7 exact printings

You don't lose unspent green mana as steps and phases end. Omnath gets +1/+1 for each unspent green mana you have.

From Magic: The Gathering.

Exact printings

Commander Masters - #1063 · mythic · FOIL · EN
Commander Masters - #310 · mythic · FOIL · EN
Commander Masters - #568 · mythic · ETCHED · EN
Commander Masters - #680 · mythic · FOIL · EN
Commander Collection: Green - #2 · mythic · FOIL · EN
From the Vault: Legends - #7 · mythic · FOIL · EN
Worldwake - #109 · mythic · FOIL · EN

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6oaf2p6xkppb1he664tcug.