Retrofitter Foundry + Ashnod's Altar + Clock of Omens + Kaya, Geist Hunter

Retrofitter Foundry

Ashnod's Altar

Clock of Omens

Kaya, Geist Hunter

How it works

1. Activate Kaya's second loyalty ability by removing two loyalty counters from it, causing you to double any tokens you create this turn.
2. Activate Retrofitter Foundry's second ability by paying 2 and tapping it, creating two 1/1 Servo artifact creature tokens.
3. Activate Clock of Omens by tapping the Servos, untapping Retrofitter Foundry.
4. Activate Ashnod's Altar by sacrificing a Servo, adding CC.
5. Repeat from step 2.
6. Once you have infinite mana, you may instead use Retrofitter Foundry's first ability to untap it and get infinite untapped Servo tokens.

By activating Kaya, Geist Hunter's minus ability, you set up a lucrative token-doubling engine that turns a modest investment into an exponential swarm. Retrofitter Foundry provides the initial spark by tapping to create a Servo, which Kaya's replacement effect turns into a pair of artifacts. You then leverage Clock of Omens by tapping those freshly minted Servos to untap the Retrofitter Foundry, keeping the loop going without needing outside mana. Finally, Ashnod's Altar converts one of your spare Servos into the exact colorless mana required to fund the next activation, generating infinite mana, sacrifices, and creature tokens along the way.