In reply to someone on the first page, making a creature immortal does NOT remove freeze. It just gets rid of the freeze animation on the creature. It still can't attack or use skills until the original duration of the freeze effect weares off.
I could definately see this paired with an Amagio. If you had one, or even two, of this Nymph in play, just keep using the effect on the single Amagio every turn. The Amagio will never attack, but if you let it use Gravity Pull on itself before buffing it, it'll never die, and it's like you gain 20 HP every turn, multiplied by the number of Auburn Nymphs you have in play. =/