The Erdtree

{t}: Add one mana of any color or add {w}{w}.

Everytime a creature returns from the graveyard to the battlefield, The Erdtree creates one Mana matching one of that creature's colors.

{t}: Sacrifice the Erdtree. Search your library for a card called Cardinal Sin or a card called Elden Ring, Outer
Will's Order and put it onto the battlefield.

"The Golden Order itself, unwavering, stretched to the
sky."