I added some more explanations to my post
And the card game aspect of the game is fairly simple. You have X points of "mana" in a "path" -Water, Fire, Wind, Earth, Life and Death - and each creature/spell costs Y. So when you play the creature spell, Y is decreased from your X.
Those little icons right under my name are the Paths. The little number is (you guessed it!) the amount of mana you have in each. You get 1 point of mana on every path at the beggining of a turn, AND you can play creatures that produce even more mana to speed things up.
ie: Lets say you have 7 Death and you cast a Zombie (which costs 3 Death I believe). Your Death goes to 4, and you skip the turn since you can only cast one spell or creature at a time. Starting next turn, your creature starts attacking.
See the opponent's Ice Guard (your cards are the ones on the top)? It has 3 numbers on it - 5, 4 and 8.
5 is its cost (5 Water), 4 is its attack (meaning, it causes 4 damage on the creature it attacks, or on you in case you have no creatures positioned in front of it), and 8 it its health.
Se how there's a -4 glowing on top of my Pegasus? That means it's being attacked by the Ice Guard. It's health shows 11, meaning it had 15 before that attack. If the creature's health reaches zero, it's dead.
It's pretty straight forward. No previous card game experience necessary, really.
Here's a gameplay video, you might be able to understand it better watching it:
http://www.youtube.com/watch?v=zyvoUY5evGY
And lemme give you the pros and cons:
+ Excellent graphics;
+ Suitable for both long periods of playing (the campaign) and quick games on the bus or while you wait in line (thanks to the Duel Mode). You can save multiple campaigns so you can play quick duels while you have a longer game going!
+ Amazing production values. The sound is great, the particle effects are pretty cool too.
+ $2 dude. Seriously, for that cheap there just isn't anything like Orions on the AppStore.
- There are some spelling mistakes. The dev is Russian, so I cut him some slack
- There are a few bugs (that have already been notified to the dev and he's already working on an update to fix them)
- Uses quite a lot of battery, which I can understand because graphics and effects like that always make the processor work hard, which takes a toll on the battery.