In my search for good keyboard that support AMOLED mode, I found out about FlorisBoard which looks perfect to me. It even supports Halmak Keyboard Layout, which I didn't expect to find at any Android Keyboard.
Which make me ask, How is this keyboard not popular?
Word suggestions/spell checking are not included in the current releases and are a major goal for the v0.6 milestone.
I've been watching Florisboard since before that text read "v0.5". It's a good keyboard but can't be a daily driver for me without that.