Denry Klin, Editor in Chief, Relentless Skaabs, and Ashnod's Altar

Prerequisites

• Denry Klin, Editor in Chief on the battlefield
• Relentless Skaabs on the battlefield
• Ashnod's Altar on the battlefield
• Denry Klin has at least one -1/-1 counter on it
• Relentless Skaabs does not have a +1/+1 counter on it

Steps

1. Activate Ashnod's Altar by sacrificing Relentless Skaabs, adding
2. Relentless Skaabs dies, triggering its undying ability, returning it from your graveyard to the battlefield with a +1/+1 counter on it
3. Relentless Skaabs enters the battlefield, triggering Denry Klin, putting a -1/-1 counter on Relentless Skaabs
4. Repeat

Results

• Infinite colorless mana
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers