Yedora, Grave Gardener, Phyrexian Altar, and Aphetto Alchemist

Prerequisites

• Yedora, Grave Gardener on the battlefield
• Phyrexian Altar on the battlefield
• Aphetto Alchemist on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing Aphetto Alchemist, adding
2. When Aphetto Alchemist dies, Yedora triggers, returning Aphetto Alchemist from your graveyard to the battlefield face down as a Forest land
3. Activate Aphetto Alchemist by tapping it, adding
4. Activate Aphetto Alchemist'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