Bloodline Necromancer, Molten Echoes, and Phyrexian Altar

Prerequisites

• Bloodline Necromancer in hand
• Molten Echoes on the battlefield
• Phyrexian Altar on the battlefield
• "Vampire" or "Wizard" chosen with Molten Echoes
• available

Steps

1. Cast Bloodline Necromancer by paying
2. Bloodline Necromancer enters the battlefield, triggering itself and Molten Echoes
3. Resolve the Bloodline Necromancer trigger, returning a Vampire or Wizard creature card from your graveyard to the battlefield
4. Activate Phyrexian Altar by sacrificing Bloodline Necromancer, adding one mana of any color
5. Resolve the Molten Echoes trigger, creating a token copy of Bloodline Necromancer with haste
6. The token Bloodline Necromancer enters the battlefield, returning the nontoken Bloodline Necromancer from your graveyard to the battlefield
7. Repeat from step 2

Results

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