Agatha of the Vile Cauldron + Earthcraft + Umbral Mantle

RG identity

Commander legal

The 3 combo pieces

• Agatha of the Vile Cauldron
• Earthcraft
• Umbral Mantle

What must be in place

Umbral Mantle attached to a creature that does not have summoning sickness.
Agatha of the Vile Cauldron has power 2 or greater.
You control at least one basic land.

How to execute it

1. Activate a basic land by tapping it, adding {1}.
2. Activate Earthcraft by tapping the creature with Umbral Mantle attached, untapping the basic land.
3. Activate the creature by paying {1} due to Agatha of the Vile Cauldron and untapping it, giving itself +2/+2 until end of turn.
4. Repeat.

What the combo produces

• Infinitely large creature until end of turn