Any Keyboard that can do this?

I believe Swiftkey will do that.
SwiftKey - Intelligent text prediction for Android smartphones, by TouchType Ltd.

 

Welcome to the forum!

It depends on what you mean by "cover up the original screen when you are typing".

• When you bring up the virtual keyboard in portrait mode, the application UI will be partially covered by the keyboard, and your typing should appear directly in the application field.
• When you bring up the virtual keyboard in landscape mode, the application UI will be entirely replaced by the virtual keyboard, and your typing should appear in a temporary field. When you close the keyboard, the text will appear in whatever field was selected.
• In either case, if your keyboard offers predictive suggestions, these will appear in a strip just above the keyboard.

Personally speaking, I absolutely abhor the "no UI" solution for landscape mode, as it makes a range of applications effectively useless. Sadly, that's the way it has to be -- the first two points (if not all three) apply to all keyboards because that's the dictated working from the OS. You simply cannot make a "transparent overlay" in Android.