Yedora, Grave Gardener, Ambush Commander, and Thaumatog

Prerequisites

• Yedora, Grave Gardener on the battlefield
• Ambush Commander on the battlefield
• Thaumatog on the battlefield
• You control at least one additional nontoken Forest

Steps

1. Activate Thaumatog's first ability by sacrificing a nontoken Forest, which is a creature due to Ambush Commander
2. When the Forest dies, Yedora triggers, returning the Forest from your graveyard to the battlefield face down as a Forest land
3. Resolve the Thaumatog ability, giving it +1/+1 until end of turn
4. Repeat

Results

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