Tranquil Undergrowth

Tranquil Undergrowth enters the battlefield
tapped with a Seed counter on it for each card in
your graveyard.
{t}: Add {g} or {b}.
{t}, Remove a Seed counter from Tranquil Undergrowth: Add {g}{b}.
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Yavimaya has secrets beneath the earth. Even with a catastrophe, it has the will to regrow itself from ashes.