Ratadrabik of Urborg, Nazgûl, and Phyrexian Altar

Prerequisites

• Ratadrabik of Urborg on the battlefield
• Nazgûl in hand
• Phyrexian Altar on the battlefield
• available

Steps

1. Cast Nazgûl by paying
2. Nazgûl enters, triggering its first activated ability, causing the Ring to tempt you; choose Nazgûl as your Ring-bearer, making it legendary
3. Nazgûl's second activated ability triggers, putting a +1/+1 counter on each Wraith you control
4. Activate Phyrexian Altar by sacrificing Nazgûl, adding one mana of any color
5. Ratadrabik of Urborg triggers, creating a token copy of Nazgûl that's a 2/2 Zombie
6. Repeat from step 2

Results

• Infinite LTB
• Infinite ETB
• Infinite colored mana
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite creature tokens