Wake Thrasher, and Aphetto Alchemist

Prerequisites

• Wake Thrasher on the battlefield
• Aphetto Alchemist on the battlefield
• Aphetto Alchemist does not have summoning sickness

Steps

1. Activate Aphetto Alchemist by tapping it, untapping itself
2. Wake Thrasher triggers, getting +1/+1 until end of turn
3. Repeat

Results

• Infinitely large creature until end of turn