Yedora, Grave Gardener, Phyrexian Altar, and Monastery Flock

Prerequisites

• Yedora, Grave Gardener on the battlefield
• Phyrexian Altar on the battlefield
• Monastery Flock on the battlefield

Steps

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