At the top end youve got an assortment of the main Eldrazi titans: Emrakul, the Promised End, Kozilek, Butcher of Truth, and both Ulamog, the Ceaseless Hunger and Ulamog, the Defiler
A brilliant idea, however, is only half the battle
Why the switch
Not the strongest of removal spells, but Self-Destruct is great at sacrificing a creature thats already about to die, and you might even have some fun with Jumbo Cactuar
Writing out my "Paths Not Traveled", I kept feeling more and more enamored of the fact that Nim Deathmantle brings a creature back as a Zombie
Emrakul, the Aeons Torn isn't easy to get into play through mana, but spells like Summoning Trap, Through the Breach, and Sneak Attack can and have been used to cheat Emrakul into play for far fewer mana