Yedora, Grave Gardener, Phyrexian Altar, and Ruthless Ripper

Prerequisites

• Yedora, Grave Gardener on the battlefield
• Phyrexian Altar on the battlefield
• Ruthless Ripper on the battlefield
• You have at least one black card in hand

Steps

1. Activate Phyrexian Altar by sacrificing Ruthless Ripper, adding one mana of any color
2. When Ruthless Ripper dies, Yedora triggers, returning Ruthless Ripper from your graveyard to the battlefield face down as a Forest land
3. Activate Ruthless Ripper's morph ability by revealing a black card from your hand, turning it face up
4. Repeat

Results

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