Yedora, Grave Gardener, Ashnod's Altar, Urborg, Tomb of Yawgmoth, and Kormus Bell

Prerequisites

• Yedora, Grave Gardener on the battlefield
• Ashnod's Altar on the battlefield
• Urborg, Tomb of Yawgmoth on the battlefield
• Kormus Bell on the battlefield
• You control at least one additional nontoken creature

Steps

1. Activate Ashnod's Altar by sacrificing another nontoken creature you control, adding
2. When the creature dies, Yedora triggers, returning the creature from your graveyard to the battlefield face down as a Forest land and as a 1/1 Swamp creature due to Kormus Bell and Urborg
3. Repeat

Results

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