Not really. It says summon a "different copy". So the first copy that's consumed only plays for 4pts. No one is wasting Caranthir on this card so you'd have to then add two copies so it can maybe play for 8 or more.
Yeah. You gotta play it earlier in the game so that it's in graveyard in R3. Once that is done, the second one is a Ruehin for 4 turns. You can use it for dry pass, for example. The first one can count like 4 body 4/8-ish carryover. Pretty cool design. I like it.