Puppet Conjurer + Dross Scorpion + Ashnod's Altar + Gemstone Array

Puppet Conjurer

Dross Scorpion

Ashnod's Altar

Gemstone Array

How it works

1. Activate Puppet's Conjurer by paying and tapping it, creating a 0/1 Homunculus artifact creature token.
2. Activate Ashnod's Altar by sacrificing the Homunculus, adding CC.
3. When the Homunculus dies, Dross Scorpion triggers, untapping Puppet's Conjurer.
4. Activate Gemstone Array by paying 2, putting a charge counter on it.
5. Activate Gemstone Array by removing a charge counter from it, adding .
6. Repeat.