Agatha of the Vile Cauldron, Silvanus's Invoker, and City of Traitors

Prerequisites

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

Steps

1. Activate City of Traitors by tapping it, adding
2. Activate Silvanus's Invoker by paying , untapping City of Traitors 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 if you control lands that can produce 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