It's interesting Nether and I created customs with extremely similar abilities. Mine was a Guaradian Angel type that once per round or turn (forget which 1 of the 2) can roll defense instead of the unit that was attacked to prevent it from being destroyed and any wounds inflicted if any go to the Guardian Angel. The custom is on HQ.com
The wording might have been slightly perfected since I do not recall if this wsa the final version or not. The last comment on the board was roughly March 22nd and is in the customs thread. Obviously the pic and layout on the card are not great but who cares about card appearance
