Activate the creature with Careful Cultivation and Umbral Mantle attached by tapping it, adding {G}{G}.
Activate the creature by paying at most {2} and untapping it, causing it to get +2/+2 until end of turn.
Repeat.
If Agatha of the Vile Cauldron has power 2 or greater, this combo nets infinite green mana.

Infinite green mana

Infinitely large creature until end of turn

Infinite untap of creatures you control

Infinite mana creatures you control can produce

Careful Cultivation

Umbral Mantle

Agatha of the Vile Cauldron

Activate the creature with Careful Cultivation and Umbral Mantle attached by tapping it, adding {G}{G}.
Activate the creature by paying {2} and untapping it, causing it to get +2/+2 until end of turn.
Repeat.

Heartstone

Activate the creature with Careful Cultivation and Umbral Mantle attached by tapping it, adding {G}{G}.
Activate the creature by paying {1} and untapping it, causing it to get +2/+2 until end of turn.
Repeat.

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