Yedora, Grave Gardener, Hauntwoods Shrieker, and Phyrexian Altar

Prerequisites

• Yedora, Grave Gardener on the battlefield
• Hauntwoods Shrieker on the battlefield
• Phyrexian Altar on the battlefield
• You control at least one other nontoken creature

Steps

1. Activate Phyrexian Altar by sacrificing another nontoken creature you control, adding
2. When the creature dies, Yedora triggers, returning the creature from your graveyard to the battlefield face-down as a Forest land
3. Activate the creature by tapping it, adding
4. Activate Hauntwoods Shrieker by paying , turning the creature face-up
5. Repeat

Results

• Infinite LTB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite landfall triggers