Requires

Cogwork Assembler must be on the battlefield. Myr Battlesphere must be on the battlefield. Mana Echoes must be on the battlefield. Twenty-one generic mana available. Mana needed:

Steps

1. Activate Cogwork Assembler by paying , creating a token copy of Myr Battlesphere with haste.
2. When the Myr Battlesphere token enters the battlefield, it and Mana Echoes trigger.
3. Resolve the Myr Battlesphere trigger, creating four 1/1 Myr artifact creature tokens.
4. When the Myr enter the battlefield, Mana Echoes triggers four times.
5. Resolve all Mana Echoes triggers from steps 2 and 4, adding for each Myr you control.
6. Repeat.
7. Once you have infinite mana, you may target any artifact instead using Cogwork Assembler's ability.
8. Activate Cogwork Assembler three times by paying three times, creating three token copy of Cogwork Assembler with haste.
9. The token copies of Cogwork Assembler enter the battlefield triggering Mana Echoes three times, adding twelve .
10. Activate Cogwork Assembler by paying , creating a token copy of Cogwork Assembler with haste.
11. The token copy of Cogwork Assembler enters the battlefield triggering Mana Echoes, adding .
12. Activate Cogwork Assembler by paying , creating a token copy of Cogwork Assembler with haste.
13. The token copy of Cogwork Assembler enters the battlefield triggering Mana Echoes, adding .
14. Activate Cogwork Assembler by paying , creating a token copy of Cogwork Assembler with haste.
15. The token copy of Cogwork Assembler enters the battlefield triggering Mana Echoes, adding at least .
16. Repeat from step seven.

Results