Yedora, Grave Gardener, Phyrexian Altar, and Grim Haruspex

Prerequisites

• Yedora, Grave Gardener on the battlefield
• Phyrexian Altar on the battlefield
• Grim Haruspex on the battlefield

Steps

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