Out of everything there, I think Damping Quill is interesting, and I like the idea. But it's very narrow and underpowered.
I'd make it as:
Damping Quill [2]
Artifact
When Damping Quill comes into play, sacrifice an artifact and choose a card type other than land.
Spells of the chosen type cost [2] more to play.
I think Quill is fine. It'd be Stax' Rebuild protector.