Yedora, Grave Gardener, Granite Witness, Skirk Alarmist, and Sarcatog

Prerequisites

• Yedora, Grave Gardener on the battlefield
• Granite Witness on the battlefield
• Skirk Alarmist on the battlefield
• Sarcatog on the battlefield
• Skirk Alarmist does not have summoning sickness

Steps

1. Activate Sarcatog's second ability by sacrificing Granite Witness
2. When Granite Witness dies, Yedora triggers, returning Granite Witness from your graveyard to the battlefield face-down as a Forest land
3. Resolve the Sarcatog ability, giving it +1/+1 until end of turn
4. Activate Granite Witness by tapping it, adding
5. Activate Skirk Alarmist by tapping it, turning Granite Witness face-up
6. Granite Witness triggers, untapping Skirk Alarmist
7. Repeat

Results

• Infinite LTB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite green mana
• Infinite landfall triggers
• Infinitely large Sarcatog until end of turn