Yedora, Grave Gardener, Proteus Machine, and Ashnod's Altar

Prerequisites

• Yedora, Grave Gardener on the battlefield
• Proteus Machine on the battlefield
• Ashnod's Altar on the battlefield

Steps

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

Results

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