Slobad, Iron Goblin + Enduring Renewal + Dross Scorpion + Mycosynth Lattice

Slobad, Iron Goblin

Enduring Renewal

Dross Scorpion

Mycosynth Lattice

How it works

1. Activate Slobad by tapping it and sacrificing Dross Scorpion, adding 4 that can only be spent to cast artifact spells or to activate abilities of artifacts.
2. Dross Scorpion dies, triggering itself and Enduring Renewal.
3. Resolve the Dross Scorpion trigger, untapping Slobad.
4. Resolve the Enduring Renewal trigger, returning Dross Scorpion from your graveyard to your hand.
5. Cast Dross Scorpion by paying 4.
6. Repeat.