Color Identity: U

Initial Card State
- Horseshoe Crab in exile (exiled by Agatha's Soul Cauldron).
- Steelswarm Operator and Agatha's Soul Cauldron on the battlefield (Steelswarm Operator with a +1/+1 counter on it and without summoning sickness).
Steps
- Activate Steelswarm Operator's second ability by tapping it, adding ({U} magic symbol)
({U} magic symbol)
that can only be spent to activate abilities of artifacts. - Activate Steelswarm Operator using Horseshoe Crab's ability by paying ({U} magic symbol)
, untapping it. - Repeat.
Notes
- Once you have infinite mana, you can use Steelswarm Operator's first ability instead.
Results
- Infinite blue mana that can only be spent to activate abilities of artifacts.
- Infinite blue mana that can only be spent to cast artifact spells.
Bracket Tag
This combo has been estimated to be Exhibition (Bracket 1+).