Yedora, Grave Gardener, Ashnod's Altar, and Ruthless Ripper

Prerequisites

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

Steps

1. Activate Ashnod's Altar by sacrificing Ruthless Ripper, adding
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 by tapping it, adding
4. Activate Ruthless Ripper's morph ability by revealing a black card from your hand, turning it face up
5. When Ruthless Ripper is turned face up, it triggers, causing target player to lose 2 life
6. Repeat

Results

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