Cogwork Assembler + Esika's Chariot + Ashnod's Altar + Kaya, Geist Hunter

Cogwork Assembler

Esika's Chariot

Ashnod's Altar

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 Cogwork Assembler by paying 7, creating two token copies of Esika's Chariot.
3. When the Esika's Chariots enter the battlefield, their first abilities trigger, creating four 2/2 Cat creature tokens.
4. Activate Ashnod's Altar four times by sacrificing the Cats, adding eight C.
5. Repeat from step 2.
6. Once you have infinite mana, you may forego sacrificing the Cats and/or target any other artifact using Cogwork Assembler.

This explosive engine relies on Kaya, Geist Hunter’s minus-two ability to set up a permanent token-doubling effect for the turn, supercharging how many artifacts and creatures enter the battlefield. When you activate Cogwork Assembler to copy Esika's Chariot, Kaya doubles the resulting artifact tokens, which in turn triggers both Chariots to flood the board with extra Cat tokens. You can then feed those newly minted Cats to Ashnod's Altar, generating more than enough colorless mana to recast the activation cost and leave you with a massive surplus.