You can only send 1 normal monster (at least for me) from the deck to the gy. Read the description for advance ritual art. It needs to match the monsters lv and nekroz cards says "without using any Level"
That's what i said, using advance ritual art they have to match the level of that monster. But some nekroz negates that rule so you'd have to use that Ghishki monster that lets you use it as a whole and use the SR nekroz ritual spell. I wasn't looking at the main "ace" ritual card description