Agatha of the Vile Cauldron, Silvanus's Invoker, and Castle Garenbrig

Prerequisites

• Agatha of the Vile Cauldron on the battlefield
• Silvanus's Invoker on the battlefield
• Castle Garenbrig on the battlefield
• Agatha of the Vile Cauldron has power 7 or greater
• available

Steps

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

Results

• Infinitely large creatures except Agatha of the Vile Cauldron until end of turn
• Infinite mana lands you control can produce
• Infinite untap of lands you control