Arwen Undómiel, Elrond, Lord of Rivendell, and Basking Broodscale

Prerequisites

• Arwen Undómiel on the battlefield
• Elrond, Lord of Rivendell on the battlefield
• Basking Broodscale on the battlefield
• You have a way to cause a creature to enter the battlefield under your control

Steps

1. Cause a creature to enter the battlefield under your control
2. Elrond triggers, causing you to scry 1
3. Arwen Undómiel triggers, putting a +1/+1 counter on Basking Broodscale
4. Basking Broodscale triggers, creating a 0/1 Eldrazi Spawn creature token
5. Repeat from step 2

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite scry 1
• Infinite colorless mana
• Infinite creature tokens
• Infinite +1/+1 counters on Basking Broodscale