Urza, Lord High Artificer, Wake Thrasher, and Pemmin's Aura

Prerequisites

• Urza, Lord High Artificer on the battlefield
• Wake Thrasher on the battlefield
• Pemmin's Aura on the battlefield
• Pemmin's Aura attached to an artifact creature you control

Steps

1. Activate Urza's first ability by tapping the creature with Pemmin's Aura attached, adding
2. Activate Pemmin's Aura by paying , untapping the creature it is attached to
3. Wake Thrasher triggers, giving itself +1/+1 until end of turn
4. Repeat

Results

• Infinitely large Wake Thrasher until end of turn