This delightful loop lets you cast and sacrifice Walking Ballista on an infinite loop, powered entirely by the mana economy of Ashnod's Altar and the protective recursion of Together Forever. Because Umori, the Collector shares the same card type as your spells and acts as your companion, it neatly reduces the casting cost of your artifacts or creatures to keep your mana positive. You spend just one mana to cast Walking Ballista, sacrifice it for two colorless mana to Ashnod's Altar, and use Together Forever's activated ability to bounce it right back to your hand when it dies, generating infinite death, sacrifice, and storm triggers along the way.