Agatha of the Vile Cauldron, Umbral Mantle, and Cryptolith Rite

Prerequisites

• Agatha of the Vile Cauldron on the battlefield
• Umbral Mantle on the battlefield
• Cryptolith Rite on the battlefield

Steps

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

Results

• Infinite power and toughness for a creature until end of turn