Yedora, Grave Gardener, Birchlore Rangers, and Ashnod's Altar

Prerequisites

• Yedora, Grave Gardener on the battlefield
• Birchlore Rangers on the battlefield
• Ashnod's Altar on the battlefield

Steps

1. Activate Ashnod's Altar by sacrificing Birchlore Rangers, adding
2. Birchlore Rangers dies, triggering Yedora, returning Birchlore Rangers to the battlefield face down as a Forest land with no other types or abilities
3. Activate Birchlore Rangers by tapping it, adding
4. Activate Birchlore Rangers's morph ability by paying , turning it face up
5. Repeat

Results

• Infinite colorless mana
• Infinite death triggers
• Infinite ETB
• Infinite landfall triggers
• Infinite LTB
• Infinite sacrifice triggers