Silvanus's Invoker + Agatha of the Vile Cauldron + Everglades

Silvanus's Invoker

Agatha of the Vile Cauldron

Everglades

How it works

1. Activate Everglades by tapping it, adding two mana.
2. Activate Silvanus's Invoker by paying 1, untapping Everglades 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 any number of times.
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.

By leveraging Agatha of the Vile Cauldron's power-based cost reduction, we can discount the hefty activation cost of Silvanus's Invoker down to a mere single generic mana. This discount creates an infinite mana loop when targeting Everglades, since the land's ability produces more than enough resources to pay the reduced activation cost and untap itself in a continuous cycle. Once this engine generates infinite black and colorless mana, that same untap loop allows you to endlessly cycle any other lands you control. Finally, you can pour those vast reserves into Agatha of the Vile Cauldron's pump ability to give the rest of your board astronomical stats along with trample and haste for the turn.