Bloodline Necromancer + Flameshadow Conjuring + Phyrexian Altar

Bloodline Necromancer

Flameshadow Conjuring

Phyrexian Altar

How it works

1. Cast Bloodline Necromancer by paying 4.
2. When Bloodline Necromancer enters the battlefield, it and Flameshadow Conjuring trigger.
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 .
5. Resolve the Flameshadow Conjuring trigger, causing you to pay to create 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.

This clever loop relies on Bloodline Necromancer's ability to pull another Vampire or Wizard—or even a copy of itself—straight out of your graveyard whenever it enters the battlefield. By channeling the red mana generated when you sacrifice the Necromancer to Phyrexian Altar, you can pay for Flameshadow Conjuring's triggered ability to instantly spawn a hasty token copy. That fresh token enters to repeat the graveyard resurrection cycle indefinitely, yielding an endless cascade of creature tokens, sacrifice triggers, and colored mana.