Berta, Wise Extrapolator, Ant Queen, Ashnod's Altar, and Donatello, the Brains

Prerequisites

• Berta, Wise Extrapolator on the battlefield
• Ant Queen on the battlefield
• Ashnod's Altar on the battlefield
• Donatello, the Brains on the battlefield
• available

Steps

1. Activate a Mutagen by paying , tapping and sacrificing it, putting a +1/+1 counter on Berta
2. Berta triggers, adding
3. Activate Ant Queen by paying , creating a 1/1 Ant creature token and a Mutagen token due to Donatello
4. Activate Ashnod's Altar by sacrificing the Ant, adding
5. Repeat

Results

• Infinite artifact ETB
• Infinite artifact LTB
• Infinite artifact sacrifice triggers
• Infinite +1/+1 counters on a creature
• Infinite creature ETB
• Infinite creature LTB
• Infinite death triggers
• Infinite creature sacrifice triggers