Activate Steelswarm Operator's second ability by tapping it, adding {U}{U} that can only be spent to activate abilities of artifacts.
Activate Steelswarm Operator using Horseshoe Crab's ability by paying {U}, untapping it.
Repeat.

Infinite blue mana that can only be spent to cast artifact spells

Infinite blue mana that can only be spent to activate abilities of artifacts

Steelswarm Operator

Agatha's Soul Cauldron

Horseshoe Crab

Activate Steelswarm Operator's second ability by tapping it, adding {U}{U} that can only be spent to activate abilities of artifacts.
Activate Steelswarm Operator using Morphling's ability by paying {U}, untapping it.
Repeat.

Morphling

Activate Steelswarm Operator's second ability by tapping it, adding {U}{U} that can only be spent to activate abilities of artifacts.
Activate Steelswarm Operator using Soliton's ability by paying {U}, untapping it.
Repeat.

Soliton

Activate Steelswarm Operator's second ability by tapping it, adding {U}{U} that can only be spent to activate abilities of artifacts.
Activate Steelswarm Operator using Simic Ragworm's ability by paying {U}, untapping it.
Repeat.

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