Animation Module + War Elemental + Phyrexian Altar + Pandemonium

Animation Module

War Elemental

Phyrexian Altar

Pandemonium

How it works

1. Cause a creature to enter the battlefield under your control.
2. Pandemonium triggers, dealing damage to an opponent equal to the creature's power.
3. War Elemental's second ability triggers, putting a +1/+1 counter on itself.
4. Animation Module triggers, causing you to pay 1 to create a 1/1 Servo artifact creature token.
5. When the Servo enters the battlefield, Pandemonium triggers.
6. Holding priority, activate Phyrexian Altar by sacrificing the Servo, adding 1.
7. Resolve the Pandemonium trigger, dealing 1 damage to an opponent.
8. Repeat from step 3.

This loop turns a single initial spark of damage into an unstoppable engine of growth and destruction by feeding on itself at every turn. When your opening trigger allows War Elemental to enter safely and deal damage, Pandemonium ensures that any subsequent creature entering the battlefield can also strike an opponent. That incoming damage constantly fuels War Elemental with new +1/+1 counters, which in turn wakes up Animation Module to continuously churn out fresh Servo artifact creature tokens. By using Phyrexian Altar to sacrifice those Servos for the exact mana needed to pay for Animation Module's trigger, you create a self-sustaining cycle that continuously powers up your War Elemental while dealing infinite damage through Pandemonium.