Careful Cultivation + Umbral Mantle + Agatha of the Vile Cauldron

Careful Cultivation
Umbral Mantle
Agatha of the Vile Cauldron
Requires
Careful Cultivation must be on the battlefield. Umbral Mantle must be on the battlefield. Agatha of the Vile Cauldron must be on the battlefield. Umbral Mantle and Careful Cultivation attached to the same creature you control that does not have summoning sickness.
Steps
  1. Activate the creature with Careful Cultivation and Umbral Mantle attached by tapping it, adding .
  2. Activate the creature by paying at most 2 and untapping it, causing it to get +2/+2 until end of turn.
  3. Repeat.
  4. If Agatha of the Vile Cauldron has power 2 or greater, this combo nets infinite green mana.
Results
Infinite green mana. Infinitely large creature until end of turn.
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