Agatha of the Vile Cauldron, Silvanus's Invoker, and High Tide

Prerequisites

• Agatha of the Vile Cauldron on the battlefield
• Silvanus's Invoker on the battlefield
• High Tide on the battlefield
• available

Steps

1. Cast High Tide by paying
2. Activate an Island by tapping it, adding
3. High Tide triggers, adding
4. Activate Silvanus's Invoker by paying , 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
5. Repeat from step 2

Results

• Infinite mana lands you control can produce
• Infinite power and toughness for most creatures you control until end of turn
• Infinite untap of lands you control