That's just it - They didn't give Castiel Angel Powers, they simply amped his already existing ones up to 11. However considering this . .
You have a point about powerful reality warping, though there are Scarlet Witch moments, and "House of M" Wanda. I'm not going to argue further, just had that issue.Alternatively if you want to say that the Ebony Blade itself absorbed 50 million souls than its power would be on the levels at or beyond God Castiel as a couple hundred souls amped him up stupendously( Monica Rambeu/Wonder Man couldnt effect him) and let him Alter Reality and physics(Scarlet Witch barely contained him while he beat a whole Avengers team).
Either way Maxima is toast as her move doesn't work on WW and is reflected back at her and her team or countered in multiple ways.