Ashaya, Soul of the Wild

Mana cost: {3}{G}{G}
Type: Legendary Creature — Elemental
Power / toughness: * / *
Set: The List #DSC-170 (mythic)

Ashaya's power and toughness are each equal to the number of lands you control.
Nontoken creatures you control are Forest lands in addition to their other types. (They're still affected by summoning sickness.)

Ashaya, Soul of the Wild has 8 printings, first in Zendikar Rising (2020). EDHREC ranks it #841 among Commander cards. It appears most in Toph, the First Metalbender decks (15,142 on EDHREC). 1 public deck on TCG runs it. It has 5 official rulings.

Legality

commander: legal
legacy: legal
vintage: legal
pauper: not legal
modern: legal
pioneer: legal
standard: not legal
brawl: legal

Public decks that run Ashaya, Soul of the Wild

Jump Scare! - Duskmourn: House of Horror Commander, led by Zimone, Mystery Unraveler

Commanders that run Ashaya, Soul of the Wild most

Deck counts from EDHREC.

Toph, the First Metalbender: 15,142 decks
Zimone, Mystery Unraveler: 12,502 decks
Omnath, Locus of Creation: 8,137 decks
Lumra, Bellow of the Woods: 5,920 decks
Aesi, Tyrant of Gyre Strait: 5,178 decks
Tifa Lockhart: 3,466 decks
Bumi, Unleashed: 3,132 decks
Azusa, Lost but Seeking: 2,955 decks

Often played with Ashaya, Soul of the Wild

Cards that show up in the same decks on EDHREC.

Rulings

2020-09-25: As long as Ashaya is on the battlefield, it's affected by its second ability and thus its first ability counts itself.
2020-09-25: Because damage remains marked on a creature until the damage is removed as the turn ends, nonlethal damage dealt to Ashaya may become lethal if lands you control leave the battlefield during that turn.
2020-09-25: A land that's a Forest has the intrinsic mana ability "{T}: Add {G}."
2020-09-25: The ability that defines Ashaya's power and toughness applies in all zones, not just the battlefield.
2020-09-25: You can't play creature cards as lands; you'll still have to cast them as spells, and they'll enter the battlefield as lands (in addition to their other types).