Splinter Twin + Dross Scorpion + Krark-Clan Ironworks

Splinter Twin

Dross Scorpion

Krark-Clan Ironworks

How it works

1. Activate Dross Scorpion by tapping it, creating a copy of it with haste.
2. Activate Krark-Clan Ironworks by sacrificing the Dross Scorpion copy, adding CC.
3. The Dross Scorpion copy dies, triggering itself and every Dross Scorpion on the battlefield.
4. Resolve the first Dross Scorpion trigger, untapping the Dross Scorpion enchanted by Splinter Twin.
5. Activate the Dross Scorpion enchanted by Splinter Twin by tapping it, creating a copy of it with haste.
6. Repeat steps 4-5 for each remaining trigger.
7. Repeat from step 2.