Root systems in Mwonvuli twist through currents of mana rather than soil.

Wall of Roots

Defender
Put a -0/-1 counter on this creature: Add {G}. Activate only once each turn.

"Mana grows and changes like the roots of a plant. Like a plant, it must be nurtured."
—Nissa Revane

The List

Sometimes the wise ones wove their magic into living plants; as the plant grew, so grew the magic.

30th Anniversary Play Promos

New Capenna Commander

Defender
Put a -0/-1 counter on Wall of Roots: Add {G}. Activate only once each turn.

Iconic Masters

Defender
Put a -0/-1 counter on Wall of Roots: Add {G} to your mana pool. Activate this ability only once each turn.

Magic Online Promos

If you must sacrifice a creature to pay a casting or activation cost that also includes mana, such as that of Bubbling Cauldron's abilities, you may put a -0/-1 counter on Wall of Roots to make its toughness 0 and then sacrifice it to pay that cost.