Agatha of the Vile Cauldron + Silvanus's Invoker + City of Traitors

Agatha of the Vile Cauldron

Silvanus's Invoker

City of Traitors

How it works

1. Activate City of Traitors by tapping it, adding CC.
2. Activate Silvanus's Invoker by paying 1, 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.

This elegant engine relies on Agatha of the Vile Cauldron to act as a permanent discount pump, lowering the cost of Silvanus's Invoker's activation down to a mere single generic mana. With that cost reduction in place, tapping City of Traitors for two colorless mana more than pays to untap it over and over again into an 8/8 elemental powerhouse, generating infinite colorless mana in the process. Because Silvanus's Invoker targets *any* land, you can then pivot that infinite untap loop to cycle through the rest of your lands, using the excess mana to fuel Agatha of the Vile Cauldron's buff and trample-granting ability for a game-ending strike.