Not necessarily inner focus. Gogtetsu and Phoenix Fire on your own Panddo are also used.
Also Crescent Spear+pandamonium+ghost lightning. Or pandamonium+lighning+lightning.
Now try to do it yourself, and you’ll understand it’s balanced.
- Have to get 3 specific cards in your hand. I’m too lazy to calculate probablity, but it’s low.
- Empty your hand after this combo - 3 cards less is no joke.
Vanar 5 mana 3 dmg to all enemy minions is much more evil.