All that said, Ruhan remains in relative obscurity, highlighted infrequently by an episode of Game Knights and myself
The main nightmare scenario would be something like Balamb T-Rexaur which can wall off the Chocobo until it goes away
In some situations it is easily abused and the drawback negated, in others where you face off against brutally redundant decks of burn it is a complete liability
Chaos: Whenever you roll Chaos, you may exchange life totals with target opponent
Combined with Frodo's low power and the Ring emblems giving you skulk he should be able to get through to generate your card draw, and the draw / discard means you can put big fatties for reanimation into your yard fairly easily
Of course, a dedicated Etrata deck will usually have even better ways to cheat this downside: phasing or flickering her out of play before the shuffle, attacking with copies of the original or copying the trigger itself, or even destroying the target with some other assassin in response to fizzle the shuffle