Yedora, Grave Gardener, Embodiment of Insight, and Ashnod's Altar

Prerequisites

• Yedora, Grave Gardener on the battlefield
• Embodiment of Insight on the battlefield
• Ashnod's Altar on the battlefield
• You control a nontoken land creature

Steps

1. Activate Ashnod's Altar by sacrificing a nontoken land creature, adding
2. The land creature dies, triggering Yedora, returning it to the battlefield face down as a Forest land
3. The Forest enters the battlefield, triggering Embodiment of Insight, causing the Forest to become a 3/3 Elemental creature with haste in addition to its other types
4. Activate the Elemental by tapping it, adding
5. Repeat

Results

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