Norn's Choirmaster + Crystalline Crawler + Cryptic Trilobite + Eldrazi Displacer

Norn's Choirmaster

Crystalline Crawler

Cryptic Trilobite

Eldrazi Displacer

How it works

1. Activate Eldrazi Displacer by paying 2C, blinking your commander.
2. Your commander enters the battlefield, triggering Norn's Choirmaster, putting a +1/+1 counter on Cryptic Trilobite and Crystalline Crawler.
3. Activate Crystalline Crawler's first ability by removing a +1/+1 counter from it, adding 1.
4. Activate Cryptic Trilobite's first ability by removing a +1/+1 counter from it, adding CC that can only be spent to activate abilities.
5. Repeat.