No backlash against your own creatures for playing it, no chance of your opponent playing most Clone effects to copy your game plan, and a solid way to restrict the creatures any deck using blue can even put into play
Basically, the same number of valuable cards it takes to make two solid $10/pack MSRP Masters sets could be used to make three solid $7/pack MSRP Masters sets, which would go a long way toward making the Masters -set model viable over the mid-term
Card prices are up 568.7% all time, up 5.0% over 30 days, and up 3.3% year-to-date
There may be stronger options depending on the specific deck strategy, such as Ashiok, Nightmare Muse for additional disruption or Grave Titan for more immediate board impact, but Sephiroth could definitely find a place in the right deck due to its versatility and potential for snowballing advantage
Toph, the First Metalbender (Naya) This is my personal chase card