Together Forever + Ashnod's Altar + Cloud Key + Walking Ballista

Together Forever

Ashnod's Altar

Cloud Key

Walking Ballista

How it works

1. Cast Walking Ballista by paying 1, causing it to enter the battlefield with a +1/+1 counter on it.
2. Activate Together Forever by paying 1, targeting Walking Ballista.
3. Activate Ashnod's Altar by sacrificing Walking Ballista, adding CC.
4. When Walking Ballista dies, Together Forever triggers, returning Walking Ballista from your graveyard to your hand.
5. Repeat.

This clever loop relies on Cloud Key naming "artifact" to make casting Walking Ballista cost just one mana, perfectly matching the colorless mana generated by sacrificing it to Ashnod's Altar. To keep the cycle going, Together Forever uses its activated ability to place a delayed return trigger on Walking Ballista, ensuring that every time the automaton hits the graveyard, it bounces right back to your hand. Because Walking Ballista enters with a +1/+1 counter even when cast for minimal investment, it satisfies Together Forever's requirement right away, fueling an endless loop of sacrifices and casts.