Tawnos, Solemn Survivor, Great Oak Guardian, and Krark-Clan Ironworks

Prerequisites

• Tawnos, Solemn Survivor on the battlefield
• Great Oak Guardian in the graveyard
• Krark-Clan Ironworks on the battlefield
• available

Steps

1. Activate Tawnos's second ability by paying , tapping it and sacrificing two artifact tokens, exiling Great Oak Guardian from your graveyard and creating a token copy of it that is an artifact in addition to its other types
2. When the Great Oak Guardian token enters, it triggers, untapping all creatures you control and giving them +2/+2 until end of turn
3. Activate Tawnos's first ability by paying and tapping it, creating a copy of the Great Oak Guardian token and causing you to mill two cards
4. When the Great Oak Guardian token enters, it triggers, untapping all creatures you control and giving them +2/+2 until end of turn
5. Activate Krark-Clan Ironworks by sacrificing a Great Oak Guardian token, adding
6. Repeat from step 3

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite self-mill
• Infinite untap of creatures you control
• Infinite mana creatures you control can produce
• Infinite power and toughness for creatures you control until end of turn