Great Serpent Mound

Great Serpent Mound doesn't untap during your
untap step.
{3}{t}: Bury target artifact or enchantment.
{2}{w}{ut}: Return target artifact or enchantment
in a graveyard to its owner's hand.
"Whoso shall hide up treasures in the earth shall find
them again no more, because of the great curse of the
land, save he be a righteous man and shall hide it up
unto the Lord." — Helaman 13:18