I was thinking of some ideas but of-course I'm not good with mechanics so the idea is:
Undo: Remove last action from target.
Repeat: Replay last action on target.
simple?
The next two could be Life, Death, or the pseudo element Blood.
Sacrifice target creature, heal yourself = to its current hit points.
the other is sort of the opposite. player use 5 hit points to heal target creature up to 5 hp.
