Its a great way to have a creature spell scale up as you get more mana, and offers some huge potential plays when it comes to reanimation spells
With cards like Kruphix, God of HorizonsKruphix, God of Horizons, Inga and EsikaInga and Esika, Xolatoyac, the Smiling FloodXolatoyac, the Smiling Flood, and others, you can spend a lot of mana on other players' end steps to ensure they don't have as many opportunities to disrupt your game plan and to allow you to keep your own disruption spells castable at a moment's notice
WieldChishiro's blade and cut down all who would stand before you
Marcy: An Evil Tree (not a joke), Exdeath is one of the cooler villain designs
And it's not hard to see why: not only does it allow you to swing with It That Betrays as soon as it comes into play, it also protects it from eating a well-timed Murder