Agatha of the Vile Cauldron + Silvanus's Invoker + Utopia Sprawl

Agatha of the Vile Cauldron

Silvanus's Invoker

Utopia Sprawl

How it works

1. Activate the land with Utopia Sprawl attached by tapping it, adding 1.
2. Utopia Sprawl triggers, adding 1.
3. Activate Silvanus's Invoker by paying 1, untapping the land and causing it to become an 8/8 Elemental with trample and haste in addition to its other types until end of turn.
4. Repeat.

This clever loop transforms a humble land into a massive mana engine by leaning on Agatha of the Vile Cauldron, whose passive cost-reduction turns Silvanus's Invoker's heavy ability activation into a bargain. By enchanting a land with Utopia Sprawl, that single tap produces enough mana to pay the discounted activation cost and still leave a net profit. Since Silvanus's Invoker untaps the land as part of its resolution, you can loop this process infinitely to generate unbounded mana and continuously animate your lands into a lethal army.