Rasputin Dreamweaver + Cogwork Assembler + Encroaching Mycosynth

Rasputin Dreamweaver

Cogwork Assembler

Encroaching Mycosynth

How it works

1. Activate Cogwork Assembler by paying 7, creating a token copy of Rasputin Dreamweaver with haste.
2. Put the oldest Rasputin Dreamweaver into your graveyard due to the legend rule.
3. Activate Rasputin Dreamweaver's first ability seven times by removing seven dream counters from it, adding seven C.
4. Repeat.

Encroaching Mycosynth sets the stage by turning your creatures into artifacts, which is the secret sauce that lets Cogwork Assembler target Rasputin Dreamweaver with its copy ability. Once Cogwork Assembler generates a token copy of Rasputin, the legend rule immediately forces you to choose one to keep and send the other to the graveyard. Crucially, the fresh Rasputin Dreamweaver token arrives ready to tap and empty its stash of seven dream counters for colorless mana, funding the next activation of Cogwork Assembler and looping the process indefinitely for infinite entry and death triggers.