Silvanus's Invoker + Agatha of the Vile Cauldron + Jungle Basin

Silvanus's Invoker

Agatha of the Vile Cauldron

Jungle Basin

How it works

1. Activate Jungle Basin by tapping it, adding C.
2. Activate Silvanus's Invoker by paying 1, untapping Jungle Basin 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 clever engine transforms ordinary land-drops into a devastating powerhouse by using Agatha of the Vile Cauldron to drastically slash the activation cost of Silvanus's Invoker down to just a single generic mana. Once discounted, the Invoker can repeatedly target Jungle Basin, which effortlessly pays for its own untap activation while generating a surplus of mana. Because Jungle Basin remains a land even after being animated into an 8/8 Elemental, you can loop this process infinitely to yield boundless green and colorless mana along with an arbitrarily large army.