To be honest, Paladins and healing... it doesn't happen that much in current games and unless the loa gets used, I doubt this will be used either. It got a lot of potential though but I don't see it right now.
Not necessarily. Hooked Reaver requires you to be under 15 health when you play it. This one only requires you to restore 10 health during the current game and, from that point onwards, it's always active.
Will have same problem all other paladin heal matter cards have. It wont trigger if your opponent dont damage you if their playing combo deck or it will only trigger late game were the stats doesn't matter that much if their control. Or vs aggro they kill you before you can heal 10 and use its battle cry. I also cant see how you heal 10 before turn 4.