Although most of the Tuners are low-level and Red-Dragon Archfiend is a level eight, there's enough in the deck to easily hit the level threshold for Red Dragon Archfiend
It acts like a mini-timewalk with a lot of sweet ways to improve it like Suspend, skipping discard after an Upheaval, and dont even get me started with Venser, the Sojourner
Youre starting to feel 2017 Unstable We need one more for draft! Its the Unstable prerelease
Havengul Vampire did this for less back in 2012, and it was good, so maybe there is enough creature sacrificing late in the game to make it work
If that doesnt fit the curve, then it should be lower
For a single black mana, you get a 2/1 body that you can cast from your graveyard over and over again so long as you have the mana to do so (and you control another Zombie)