Silvanus's Invoker, and Serra's Sanctum

Prerequisites

• Silvanus's Invoker on the battlefield
• Serra's Sanctum on the battlefield
• You control at least nine enchantments

Steps

1. Activate Serra's Sanctum by tapping it, adding at least nine
2. Activate Silvanus's Invoker by paying , causing Serra's Sanctum to become a 8/8 Elemental with haste, and untapping Serra's Sanctum
3. Repeat

Results

• Infinite mana lands you control can produce
• Infinite untap of lands you control