Evereth by sacrificing another creature, putting a +1/+1 counter on
Evereth.
Animation Module triggers, causing you to pay to create a 1/1 Servo artifact creature token.
When the Servo enters the battlefield,
Mana Echoes triggers, adding for each Servo on the battlefield.
Repeat.
Notes
If there is at least one other Servo on the battlefield to start the combo, this combo nets infinite colorless mana.
If you have a way to kill
Evereth and available, you can do so after putting a significant amount of +1/+1 counters on it to deal damage to each opponent using its second ability.
Results
Infinite +1/+1 counters on a creature.
Infinite artifact ETB.
Infinite artifact LTB.
Infinite artifact sacrifice triggers.
Infinite colorless mana.
Infinite creature ETB.
Infinite creature LTB.
Infinite creature sacrifice triggers.
Infinite damage.
Infinite death triggers.
Metadata
Bracket tag
SpicyBracket 3-4+
Probably 3 or 4, but hard to classify
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5
1 · Exhibition5 · cEDH
Bracket tags are estimated from the cards and results of each combo, as a guideline rather than a strict classification.