Changeling Berserker, Karmic Guide, and Ashnod's Altar

Prerequisites

• Changeling Berserker in hand
• Karmic Guide on the battlefield
• Ashnod's Altar on the battlefield
• available

Steps

1. Cast Changeling Berserker by paying
2. Changeling Berserker enters the battlefield, championing Karmic Guide
3. Activate Ashnod's Altar by sacrificing Changeling Berserker, adding
4. Changeling Berserker dies, causing Karmic Guide to return to the battlefield from exile
5. Karmic Guide enters the battlefield, returning Changeling Berserker from your graveyard to the battlefield
6. Repeat from step 2

Results

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