Teshar, Ancestor's Apostle, Scrap Trawler, Urza's Bauble, and Krark-Clan Ironworks

Prerequisites

• Teshar, Ancestor's Apostle on the battlefield
• Scrap Trawler in the graveyard
• Urza's Bauble in hand
• Krark-Clan Ironworks on the battlefield

Steps

1. Cast Urza's Bauble by paying its mana cost
2. Teshar triggers, returning Scrap Trawler from your graveyard to the battlefield
3. Activate Urza's Bauble by tapping and sacrificing it
4. Activate Krark-Clan Ironworks by sacrificing Scrap Trawler
5. When Scrap Trawler dies, it triggers, returning Urza's Bauble from your graveyard to your hand
6. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite colorless mana
• Infinite storm count
• Infinite card draw at the beginning of the next upkeep step
• Infinite draw triggers at the beginning of the next upkeep step