Ratadrabik of Urborg, Samwise the Stouthearted, and Ashnod's Altar

Prerequisites

• Ratadrabik of Urborg on the battlefield
• Samwise the Stouthearted on the battlefield
• Ashnod's Altar on the battlefield

Steps

1. Activate Ashnod's Altar by sacrificing Samwise, adding
2. When Samwise dies, Ratadrabik triggers, creating a nonlegendary token copy of Samwise that is a 2/2 Zombie
3. When the Samwise token enters the battlefield, it triggers, returning up to one applicable card from your graveyard to your hand, and then causing the Ring to tempt you, with the Samwise token becoming your Ring-bearer
4. Repeat

Results

• Infinite colorless mana
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers