Tainted Observer + Animation Module + Crystalline Crawler + Vorinclex, Monstrous Raider + Tekuthal, Inquiry Dominus

Tainted Observer

Animation Module

Crystalline Crawler

Vorinclex, Monstrous Raider

Tekuthal, Inquiry Dominus

How it works

1. Put a +1/+1 counter on a creature you control.
2. Animation Module triggers, causing you to pay 1 to create a 1/1 Servo artifact creature token.
3. The Servo enters the battlefield, triggering Tainted Observer, causing you to pay 2 to put four +1/+1 counters on Crystalline Crawler.
4. Animation Module triggers four times.
5. Resolve the first three Animation Module triggers, choosing not to pay.
6. Activate Crystalline Crawler's first ability three times by removing three +1/+1 counters from it, adding 3.
7. Resolve the final Animation Module trigger, causing you to pay 1 to create a 1/1 Servo artifact creature token.
8. Repeat from step 3.

This intricate loop relies on Vorinclex, Monstrous Raider and Tekuthal, Inquiry Dominus to supercharge every counter and proliferation effect, turning modest triggers into an avalanche of resources. When Tainted Observer triggers off a new creature entering and has you proliferate, Vorinclex doubles the resulting counters while Tekuthal multiplies the proliferation itself, feeding a massive influx of +1/+1 counters onto Crystalline Crawler. You can then siphon mana away by removing those counters from Crystalline Crawler, using that energy to pay Animation Module's fees whenever its triggers demand it. As Animation Module churns out endless Servos to feed Tainted Observer, the whole engine sustains itself indefinitely while generating boundless mana, tokens, and counters.