Yedora, Grave Gardener, Ruthless Ripper, and Grimgrin, Corpse-Born

Prerequisites

• Yedora, Grave Gardener on the battlefield
• Ruthless Ripper on the battlefield
• Grimgrin, Corpse-Born on the battlefield

Steps

1. Activate Grimgrin by sacrificing Ruthless Ripper When Ruthless Ripper dies, Yedora triggers, returning Ruthless Ripper from your graveyard to the battlefield face down as a Forest land
2. Resolve the Grimgrin ability Activate Ruthless Ripper's morph ability by revealing a black card from your hand, turning it face up
3. Repeat

Results

• Infinite +1/+1 counters on a creature
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers
• Infinite landfall triggers
• Infinite lifeloss