There was no tutorial and I found this to be pretty confusing at first. So I made a tutorial to be implemented in game.
Opening screen/sandbox mode:
This is sandbox mode, where you can play test any deck you want before investing time and gold into it. In order to start playing the real game, sign up by simply putting in your name and password in the tabs to the side and click "log in."
Choosing starters screen:
Welcome to Open Elements The Game!
oETG is a developing re-imagination of Zanzarino's original "Elements the Game." The gameplay is very similar to the original, however, as you will find out, there are several unique features about this version. The bazaar is removed entirely and replace with packs and many balancing changes have taken place. Upgrading cards no longer costs gold(aside from pillars/pends), but instead requires 6 of a card to create one upgraded version of that card. Also, many new cards have been added as well as new "Shiny" collectible cards which are created in the same way as upgraded cards.
Assuming you have already played the original, simply start by choosing whichever element appeals to you the most, OR choose no starter and acquire packs of the element you want to use(most people recommend the latter).
Main screen:
(Point to all 4 AI enemies)
These are the 4 main AI's in the game. Defeating each of them in a duel gives you a guaranteed card and a hand full of gold depending on the AI difficulty.
(Points to Commoners)
Commoners are free of charge and give you a rather small amount of electrum. Generally, they are only used for beginners trying to get a more viable deck to grind other AI's. They always give unupgraded cards as a reward.
(Points to Mage)
Mages cost 5 to duel, but are much harder than Commoners and have much better rewards. Mages are sometimes used for grinding even by high level plays to acquire gold consistently and mindlessly with a speedy deck, but are generally more of a bridge to move on to the next level of AI similar to Commoners. They always give unupgraded cards as a reward.
(Points to Champions)
Champions cost 10 to duel, and require a solid deck to beat consistently. These are most often used to grind for gold once players reach a certain level, as Demigods tend to be very difficult to beat consistently and take longer to play. They some times give you upgraded cards as a reward.
(Points to Demigods)
Demi-gods cost 20 to duel and require a deck specifically designed to defeat them. They are generally not as good for grinding compared to Champions, but are often more enjoyable and dynamic when it comes to gameplay. They always give upgraded cards as a reward.
(Points to the deck tab, shop tab, and upgrade/sell tab)
These are the 3 tabs used to edit your deck and acquire new cards to improve your deck. The deck tab is essentially the same as vanilla aside from how you assign marks, but most of the other tabs should be pretty self explanatory.
(Points to the challenge/trade tab)
In order to pvp or trade with someone, simply type in there name(case sensitive) in this box and click on the action(Pvp or Trade) that you wish to take. In the chat box, the person will receive a message saying "(your name) wants to trade/pvp with you!" In order to accept, they simply click on the text.
(Points to reward and library tab)
Rewards are this games "redeem codes" and library is something that allows you to view the cards of other players.
(Points to arena tabs)
This is the arena. The arena in this game is very similar to that of the original, but there are only 2 Leagues rather than 4.
In order to edit your arena deck, click on arena info. Clicking on the arena T20 tab will let you view the top 20 players in arenas.
(Points to quests and colosseum tab)
Finally, we have the quest tab and colosseum tab. The quest tab let's you go on short quests for rewards such as upgraded cards and even, rares, and even nymphs! The colosseum acts as a place to do daily quests for gold rewards and even acquiring a nymph for completing them all in the same day!
That's all there is to it, the gameplay is pretty much the same as the original with some slight changes in ordering(permanents are counted before creatures) and mulligans were added as well. Aside from that, you should be set! Goodluck and happy grinding.