Yedora, Grave Gardener, Phyrexian Altar, and Rattleclaw Mystic

Prerequisites

• Yedora, Grave Gardener on the battlefield
• Phyrexian Altar on the battlefield
• Rattleclaw Mystic on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing Rattleclaw Mystic, adding one mana of any color
2. When Rattleclaw Mystic dies, Yedora triggers, returning Rattleclaw Mystic from your graveyard to the battlefield face down as a Forest land
3. Activate Rattleclaw Mystic by tapping it, adding
4. Activate Rattleclaw Mystic's morph ability by paying , turning it face up
5. Rattleclaw Mystic triggers, adding
6. Repeat

Results

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