Breya, Etherium Shaper, Crime Novelist, Urza, Prince of Kroog, and Krark-Clan Ironworks

Prerequisites

• Breya, Etherium Shaper on the battlefield
• Crime Novelist on the battlefield
• Urza, Prince of Kroog on the battlefield
• Krark-Clan Ironworks on the battlefield
• available

Steps

1. Activate Urza by paying , creating a token copy of Breya that is a 1/1 Soldier
2. Put the token Breya into your graveyard due to the legend rule
3. The token Breya's enter-the-battlefield ability triggers, creating two 1/1 Thopter artifact creature tokens
4. Activate Krark-Clan Ironworks twice by sacrificing the Thopters, adding
5. Crime Novelist triggers twice, adding and putting two +1/+1 counters on it
6. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite +1/+1 counters on a creature