"Grace" and "grace only" are not the same things.
Why not? Because it doesn't fit your little man-made, man-concocted, cut-n-paste "five finger exercise"?
Ephesians 2:8 is the obvous answer - which you realize, so you move to pre-empt it by simply asserting it doesn't mean what it says.
So let's back up to Ephesians 2:5 - I know, I know, you will raise your tired, ridiculous objection that the one word you're fixated on isn't there - and let's pick up verse 4 as well, for context...
"But because of his great love for us, God, who is rich in mercy, made us alive with Christ even when we were dead in transgressions—it is by grace you have been saved."
Our loving God, in his mercy, made dead people alive. Dead people. Made alive.
Unless you can come up with one - just one - example of a dead person raising themselves to life - your point is moot. Not to menton ignorant.