Temur Sabertooth + Karametra's Acolyte + Purphoros, Bronze-Blooded

Temur Sabertooth

Karametra's Acolyte

Purphoros, Bronze-Blooded

How it works

1. Activate Karametra's Acolyte by tapping it, adding an amount of .
2. Activate Temur Sabertooth by paying 1, returning Karametra's Acolyte from the battlefield to your hand.
3. Cast Karametra's Acolyte by paying its mana cost.
4. Repeat.

This potent loop relies on generating a massive surplus of green mana to repeatedly bounce and replay your threats. Once your devotion to green is high enough, tapping Karametra's Acolyte produces more than enough mana to fund Temur Sabertooth's bounce ability and pay for the creature's subsequent recast. Meanwhile, Purphoros, Bronze-Blooded sits safely as a noncreature enchantment thanks to its devotion restriction while granting haste to any additional pieces you might deploy, though its activated ability isn't even needed here to achieve an infinite loop of enters-the-battlefield triggers.