Arunos, the Worldforge

When you cast Arunos, the Worldforge, destroy
all non-land permanents.
Threshold — {w}{u}{r}{g}: Return target creature
card from your graveyard to the battlefield. You
may sacrifice a number of lands equal to its
converted mana cost. If you do, it becomes an Enchantment God in addition to its other types,
and gains indestructible. Activate this ability only
if you have seven or more cards in your
graveyard.