1. How does the card stand on its own? Is it good, bad, or has potential? Is it worth playing?
Personally, I don't think that card will be that good on its own. Well, it somewhat can at least. Its power is essentially a Crobat G every turn without the need of Poketurns. That's why this card is literally causing so much attraction right now. The attack isn't too bad either. It can hit for 60 for one energy or 80 with an Expert Belt, but the problem is, if there's a fire Pokemon in play, then the attack does 20 damage rather than 60. That's why it can't be that good on its own. Regardless, it has potential and can be worth playing.
2. What popular metagame decks is it used in?
Literally, the only real metagame deck that uses Kingdra is literally the Kingdra deck. Here, Kingdra is used mainly for its Poke-Power, while Kingdra LA is uses as the main attacker. When Kingdra LA is played with Kingdra Prime, you literally can hit for more damage in a slightly easier way. Sadly, Kingdra isn't a real popular deck because Luxray GL destroys Kingdra.
3. What combos can you use it with? How so?
Well, there isn't really much to say here. Kingdra LA is pretty much the only the only thing that comes into mind. Here, what I can see with this combo is that it would kind of be quite a unique combo. Of course, you would be attacking with Kingdra LA most of the time, but there may be moments where you want to attack with Kingdra Prime. If there's a fire type, you simply use Kingdra LA on fire Pokemon, while on others, you use Kingdra Prime.
4. Give it a rating, and explain why you would give it that rating.
I would give Kingdra a 3.5/5. Yeah, this Kingdra is fairly decent in my opinion. He has an amazing Poke-Power and an O.K. attack. The main problem is the weakness to Luxray GL and the downside of its attack. Regardless, this card is the very reason why Kingdra has seen a somewhat boost in popularity.
5. How's the Artwork?
Here's yet another awesome artwork for a Pokemon Prime. Kingdra definitely look cool in this picture. He just gives you the stare that says, "I'm ready for a battle!"