Sea of Brine

Sea of Brine doesn't untap during your
untap step.
{t}: Add {1}. Give a land you don't control "While
the Sea of Brine that added this text remains on
the battlefield, this card doesn't untap during its
owner's untap step.". While a land with that text
remains on the battlefield, Sea of Brine cannot be untapped.
"No mana can flow where no life can grow."