Donatello, the Brains, and Basking Broodscale

Prerequisites

• Donatello, the Brains on the battlefield
• Basking Broodscale in hand
• available

Steps

1. Cast Basking Broodscale by paying
2. Activate Basking Broodscale's adapt ability by paying , putting a +1/+1 counter on it
3. Basking Broodscale triggers, creating a 0/1 Eldrazi Spawn creature token and a Mutagen token due to Donatello
4. Activate the Eldrazi Spawn by sacrificing it, adding
5. Activate the Mutagen by paying , tapping and sacrificing it, putting a +1/+1 counter on Basking Broodscale
6. Repeat from step 3

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