Infinite damage to creaturesInfinite enchantment destructionInfinite creature ETBInfinite lifegainInfinite lifegain triggersInfinite creature LTBInfinite mana lands you control can produceInfinite storm count
How it works
Activate all mana producing lands you control besides Sanctum of Eternity by tapping them, adding at least 9.
Activate Sanctum of Eternity by paying 2 and tapping it, returning Zacama from the battlefield to your hand.
Cast Zacama by paying 6.
Zacama triggers, untapping all lands you control.
Repeat.
This loop relies on having enough lands to generate at least {9}{R}{G}{W}, letting you cover the cost to recast our monstrous elder dinosaur. When you cast Zacama, Primal Calamity, its trigger untaps all your lands so you can tap them all over again. Meanwhile, Sanctum of Eternity acts as your safe haven, letting you bounce your commander right back to your hand for a modest investment of two mana. By repeatedly casting and returning the primal calamity, you get infinite triggers, infinite mana from your lands, and a battlefield wiped clean of creatures, artifacts, and enchantments.