Agatha of the Vile Cauldron, Umbral Mantle, and Earthcraft

Prerequisites

• Agatha of the Vile Cauldron on the battlefield
• Umbral Mantle on the battlefield
• Earthcraft on the battlefield
• 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

Steps

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

Results

• Infinitely large creature until end of turn