Stormcaller's Obelisk

Echoes of the Tempest: Whenever you cast an instant or sorcery spell, put a Storm Counter on Stormcaller’s Obelisk.

Thunderous Reckoning: {t}, Remove 3 Storm Counters: Deal 3 damage to each creature without flying.

Divine Stormfall: {t}, Sacrifice Stormcaller’s Obelisk: Destroy all creatures and artifacts. If you control "Ishtari, the Stormborn," instead exile all non-land permanents.