Yedora, Grave Gardener, Phyrexian Altar, and Voidmage Prodigy

Prerequisites

• Yedora, Grave Gardener on the battlefield
• Phyrexian Altar on the battlefield
• Voidmage Prodigy on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing Voidmage Prodigy, adding
2. When Voidmage Prodigy dies, Yedora triggers, returning Voidmage Prodigy from your graveyard to the battlefield face down as a Forest land
3. Activate Voidmage Prodigy by tapping it, adding
4. Activate Voidmage Prodigy's morph ability by paying , turning it face up
5. Repeat

Results

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