Yedora, Grave Gardener, Proteus Machine, and Phyrexian Altar

Prerequisites

• Yedora, Grave Gardener on the battlefield
• Proteus Machine on the battlefield
• Phyrexian Altar on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing Proteus Machine, adding one mana of any color
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's morph ability by paying , turning it face up
4. Repeat

Results

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