Yedora, Grave Gardener, Embodiment of Insight, and Altar of Dementia

Prerequisites

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

Steps

1. Activate Altar of Dementia by sacrificing a nontoken land creature
2. When the land creature dies, Yedora triggers, returning the card to the battlefield face down as a Forest land
3. When the Forest enters the battlefield, Embodiment of Insight triggers, causing the Forest to become a 3/3 Elemental creature with haste in addition to its other types
4. Resolve the Altar of Dementia ability from step 1, causing target player to mill cards equal to the sacrificed creature's power
5. Activate the Elemental by tapping it, adding
6. Repeat

Results

• Infinite death triggers
• Infinite ETB
• Infinite green mana
• Infinite landfall triggers
• Infinite LTB
• Infinite mill
• Infinite sacrifice triggers
• Infinite self-mill