Horde of Notions, Lutri, the Spellchaser, Brass's Bounty, and Yahenni, Undying Partisan

Prerequisites

• Horde of Notions on the battlefield
• Lutri, the Spellchaser in hand
• Brass's Bounty in hand
• Yahenni, Undying Partisan on the battlefield
• available

Steps

1. Cast Brass's Bounty by paying
2. Holding priority, cast Lutri by paying
3. When Lutri enters, it triggers, copying Brass's Bounty
4. Resolve the copy of Brass's Bounty, creating a Treasure token for each land you control
5. Holding priority, activate Yahenni by sacrificing Lutri
6. Activate five Treasures by tapping and sacrificing them, adding
7. Activate Horde of Notions by paying , causing you to cast Lutri from your graveyard without paying its mana cost
8. Repeat from step 3

Results

• Infinite ETB
• Infinite LTB
• Infinite Treasure tokens
• Infinite colored mana
• Infinite death triggers
• Infinite magecraft triggers
• Infinite recursion of Elemental cards in your graveyard
• Infinite sacrifice triggers
• Infinite storm count