Puppet Conjurer + Dross Scorpion + Krark-Clan Ironworks + Gemstone Array

Puppet Conjurer

Dross Scorpion

Krark-Clan Ironworks

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 Krark-Clan Ironworks 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.