Urza, Lord Protector, Scrap Trawler, Sculpting Steel, and Ashnod's Altar

Prerequisites

• Urza, Lord Protector on the battlefield
• Scrap Trawler on the battlefield
• Sculpting Steel on the battlefield
• Ashnod's Altar on the battlefield
• Scultping Steel in hand
• A player controls a nonlegendary artifact creature with mana value four or greater
• available

Steps

1. Cast Sculpting Steel by paying , choosing to have it enter the battlefield as a copy of any nonlegendary artifact creature with mana value four or greater
2. Activate Ashnod's Altar by sacrificing Sculpting Steel, adding
3. Sculpting Steel dies, triggering Scrap Trawler, returning Sculpting Steel from your graveyard to your hand
4. Repeat

Results

• Infinite storm count