Destroyer of Planes

When Destroyer of Planes enters the battlefield, each opponent discards half of their lands. When you do, add mana to your mana pool.
If Destroyer of Planes were to take damage, discard one of your lands instead. If Destroyer of Planes were to deal combat damage to an opponent, they discard one of their lands instead.
He will feast on an infinite amount of universes, but will never stop.