Bloodline Necromancer, Molten Echoes, and Yahenni, Undying Partisan

Prerequisites

• Bloodline Necromancer in hand
• Molten Echoes on the battlefield
• Yahenni, Undying Partisan on the battlefield
• available

Steps

1. Cast Bloodline Necromancer by paying
2. When Bloodline Necromancer enters the battlefield, it and Molten Echoes trigger
3. Resolve the Bloodline Necromancer trigger, returning a Vampire or Wizard creature card from your graveyard to the battlefield
4. Holding priority, activate Yahenni by sacrificing Bloodline Necromancer
5. Resolve the Molten Echoes trigger, creating a token copy of Bloodline Necromancer with haste
6. When the token Bloodline Necromancer enters the battlefield, it triggers, returning the nontoken Bloodline Necromancer from your graveyard to the battlefield
7. Repeat from step 2

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite creature tokens with haste
• Return all Vampires and Wizards from your graveyard to the battlefield