Ulalek, Fused Atrocity + Strionic Resonator + Spawn-Gang Commander

Ulalek, Fused Atrocity

Strionic Resonator

Spawn-Gang Commander

How it works

1. Cast Spawn-Gang Commander by paying 3.
2. Ulalek and Spawn-Gang Commander trigger.
3. Holding priority, activate Strionic Resonator by paying 2 and tapping it, copying Ulalek's trigger.
4. Resolve the copy of Ulalek's trigger, causing you to pay CC to copy the Spawn-Gang Commander spell, then Ulalek's trigger and Spawn-Gang Commander's trigger.
5. Resolve the copy of Spawn-Gang Commander's trigger, creating three 0/1 Eldrazi Spawn creature tokens.
6. Activate two Eldrazi Spawn creature tokens by sacrificing them, adding CC.
7. Repeat from step 4 any number of times.
8. Once you have infinite C and Eldrazi Spawn tokens, you may sacrifice them to Spawn-Gang Commander to deal infinite damage to any target(s), and you may resolve all copies of the Spawn-Gang Commander spell.