Basalt Monolith + Katsumasa, the Animator + Agatha of the Vile Cauldron
Basalt Monolith
Katsumasa, the Animator
Agatha of the Vile Cauldron
Requires
Basalt Monolith must be on the battlefield.
Katsumasa, the Animator must be on the battlefield.
Agatha of the Vile Cauldron must be on the battlefield.
Basalt Monolith does not have summoning sickness.
Mana needed: 
Steps
- Activate Katsumasa by paying , causing Basalt Monolith to become an artifact creature until end of turn.
- Activate Basalt Monolith's first ability by tapping it, adding .
- Activate Basalt Monolith's last ability by paying at most , untapping it.
- Repeat from step 2.
Results
Infinite colorless mana.
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