Agatha of the Vile Cauldron, Silvanus's Invoker, and Gruul Turf

Prerequisites

• Agatha of the Vile Cauldron on the battlefield
• Silvanus's Invoker on the battlefield
• Gruul Turf on the battlefield
• Agatha of the Vile Cauldron has power 7 or greater

Steps

1. Activate Gruul Turf by tapping it, adding
2. Activate Silvanus's Invoker by paying , untapping Gruul Turf and causing it to become an 8/8 Elemental with trample and haste in addition to its other types until end of turn
3. Repeat
4. Once you have infinite mana, you may tap and untap any other land(s) you control, and use the mana to activate Agatha of the Vile Cauldron's ability

Results

• Infinitely large creatures except Agatha of the Vile Cauldron until end of turn
• Infinite mana lands you control can produce
• Infinite untap of lands you control