What about this:
Sentinel
Victory-Reaction
Cost $3
1 VP
When you draw this during your action phase, you may discard this. If you do, +1 action, +1 coin.
You may discard this during your Action phase if you have not played any Action cards this turn. If you do, +1 action, +1 coin.
Analysis:
This card is normally a weaker Great Hall (you get +1 coin instead of +1 card), but you can't draw it dead. It also can be useful when disappearing coins are needed (Tactician, Minion, draw-to-X). It also effectively functions as a Squire (Actions only) when discarded.
Too strong? Too weak? Too cute to be useful? Your thoughts are appreciated.
*Edited*