Yedora, Grave Gardener, Ambush Commander, and Ashnod's Altar

Prerequisites

• Yedora, Grave Gardener on the battlefield
• Ambush Commander on the battlefield
• Ashnod's Altar on the battlefield
• You control at least one additional nontoken Forest

Steps

1. Activate Ashnod's Altar by sacrificing a nontoken Forest, which is a creature due to Ambush Commander, adding
2. When the Forest dies, Yedora triggers, returning the Forest from your graveyard to the battlefield face down as a Forest land
3. Repeat

Results

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