Agatha of the Vile Cauldron + Castle Garenbrig + Silvanus's Invoker

Mana needed: {2}{G}{G}

RG identity

Commander legal

The 3 combo pieces

What must be in place

Agatha of the Vile Cauldron has power 7 or greater.

How to execute it

  1. Activate Castle Garenbrig's second ability by paying {2}{G}{G} and tapping it, adding six {G} that can only be spent to cast creature spells or to activate abilities of creatures.
  2. Activate Silvanus's Invoker by paying {1}, untapping Castle Garenbrig 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 {R} and {G}, use the mana to activate Agatha of the Vile Cauldron's ability.

What the combo produces