Yedora, Grave Gardener, Phyrexian Altar, and Tribal Forcemage

Prerequisites

• Yedora, Grave Gardener on the battlefield
• Phyrexian Altar on the battlefield
• Tribal Forcemage on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing Tribal Forcemage, adding
2. When Tribal Forcemage dies, Yedora triggers, returning Tribal Forcemage from your graveyard to the battlefield face down as a Forest land
3. Activate Tribal Forcemage by tapping it, adding
4. Activate Tribal Forcemage's morph ability by paying , turning it face up
5. Tribal Forcemage triggers, giving creatures of a chosen creature type +2/+2 and trample until end of turn
6. Repeat

Results

• Infinite death triggers
• Infinite landfall triggers
• Infinite LTB
• Infinitely large creatures until end of turn
• Infinite sacrifice triggers