Mikaeus, the Unhallowed, Krark-Clan Ironworks, and Pith Driller

Prerequisites

• Mikaeus, the Unhallowed on the battlefield
• Krark-Clan Ironworks on the battlefield
• Pith Driller on the battlefield

Steps

1. Activate Krark-Clan Ironworks by sacrifiicing Pith Driller, adding
2. When Pith Driller dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it
3. When Pith Driller enters the battlefield, it triggers, putting a -1/-1 counter on it
4. Repeat

Results

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