Basalt Monolith + Sydri, Galvanic Genius + Agatha of the Vile Cauldron

Basalt Monolith
Sydri, Galvanic Genius
Agatha of the Vile Cauldron
Requires
Basalt Monolith must be on the battlefield. Sydri, Galvanic Genius must be on the battlefield. Agatha of the Vile Cauldron must be on the battlefield. Basalt Monolith does not have summoning sickness. Agatha of the Vile Cauldron has power 1 or greater. Mana needed:
Steps
  1. Activate Sydri's first ability by paying , causing Basalt Monolith to become a 3/3 artifact creature until end of turn.
  2. Activate Basalt Monolith's first ability by tapping it, adding .
  3. activate Basalt Monolith's second ability by paying at most 2, untapping it.
  4. Repeat from step 2.
Results
Infinite colorless mana.
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