Urza, Lord High Artificer, Wake Thrasher, and Soliton

Prerequisites

• Urza, Lord High Artificer on the battlefield
• Wake Thrasher on the battlefield
• Soliton on the battlefield

Steps

1. Activate Urza's first ability by tapping Soliton, adding
2. Activate Soliton by paying , untapping it
3. Wake Thrasher triggers, giving itself +1/+1 until end of turn
4. Repeat

Results

• Infinitely large Wake Thrasher until end of turn