The intent of this page is to answer some significant questions that are not made clear within the game. While some of it is decidedly there for new players (global release on Oct. 18!), there are other things that even veterans may not be fully aware of.
The Basics
Currency
There are 3 resources within the game - gold, credits, and boosters.
Gold
Gold is obtained either by real money purchase, or completing quests and battlepass levels throughout your time playing. If you are an active and engaged player, you should be getting in the neighborhood of 2000 gold per battlepass (season), which approximately 1 month in duration. You can look into the prices of gold at your own leisure, but do know that the more you buy at once, the better ratio of gold per dollar (or pick your currency) you will get.
Gold can be spent for 2 things currently - variants (skins for cards you own) or credits. Each daily reset, you are presented with 6 variants you can buy at 700 (normal) or 1200 (super rare) gold per (buy 0-6, your choice!). Alternatively, you can turn your gold into credits. There are actually 2 different ways to do this. You can purchase 2 additional quests to be completed (on the mission screen) or credits directly (from the store). The quests purchase always gives 1 "normal" and 1 "hard" quests, for a total of 150 credits. These credits come at the exact same ratio of credits:gold as if you purchase it from the store. That said, if you have the time, these quests also give some battlepass experience, to help you progress that further. As such, it is better to purchase quests if you are able to complete them and not cap your quests (6 is the maximum you can have, they refresh 2 every 8 hours). If you decide to buy in the store, the credit:gold ratio is the exact same at all price points, so don't worry about which you buy (though you will end up with awkward gold numbers if you buy the 120 gold one).
Battlepass
There are 2 other purchases that can be made for real money, the first of which is the premium battlepass. The battlepass itself is akin to that of other games in today's landscape - there is a free pass that provides certain things and specified levels, and a premium upgrade that fills in the other levels in between. This is the best rate of in-game things you will get for your money. Specifically, if you complete 50 levels of the battlepass (If you are playing daily, you should be able to do so easily - if not, unsure how hard it is and how much you give up on). This purchase will give you the season card with 65 boosters for it, 500 credits, 900 gold, 2 profile avatars, 2 random variants (this is on top of 2 from the free pass), 2 season related variants, and 75 other boosters. It is worth noting that the price of the season pass is equivalent to the price of 700 gold from the store. The pass giving 900 gold plus everything else listed above is why it is the best deal you can get, IF you are spending money.
The second is the Welcome Bundle. This gives a Captain America variant, Avatar, and 700 gold. The cost in USD is a 70% discount versus buying 700 gold otherwise, so this is also a great deal if you want to purchase gold and/or like the cosmetics.
Credits
Credits are spent to upgrade cards and progress along the collection track, increasing your CL. As you increase your CL, you will earn new cards, variants, boosters, gold, and/or credits. The probabilities and rates of each reward change with collection level (generally decreasing as you progress), so I will not put that here.
As a general rule, every 100 credits spent provides you with +2 CL. There is precisely 1 exception to this. When a new card (or new variant for an owned card) is obtained, the very first upgrade (from grey/common to green/uncommon) to a card costs 25 credits and gives +1 CL. Thus, if you upgrade 2 commons, you spent 50 credits instead of 100 for +2 CL. Once that has been done, no matter how many credits you spend at a time, you will get 2 CL per 100 credits spent. Finally, once you get a card to "infinite", you split it into a new version of the card with some change to the card's background or particle effects. This new split can be upgraded all the way back up again, starting at common (for the cheap upgrade!).
Boosters
Now, to upgrade these cards, you also need boosters for that specific card. These are earned from random rewards, or from simply playing. In general, when you finish a game, a random card in the deck you are playing is chosen, and you receive 1 booster for that card per turn played. The number required to upgrade a card increases as you increase the rarity.
To take a card from grey to infinite requires 1525 credits and 155 boosters for that specific card.
Initiative and Lanes
Initiative references the player that will have their cards flip first on a given turn. On the first turn, it is random, but it is visible if one knows where to look. At the top of the screen, 1 player will have a white glow of sorts around their name and avatar. That player has initiative. After that, the player that is currently "winning" has initiative. "But what if are both winning 1 lane and tied on the 3rd?!" The tie is broken in the same manner as it is at the end of the game - whomever is winning their victorious lane by more is the winner (or player with initiative). Do note that if 1 location is the Bar with No Name, the amount someone is winning it by is still just a simple subtraction problem, but the player with less points is the one winning that lane, clearly. If someone ever says "total points is the tiebreaker", they are correct so long as this location is not present.
The lanes do NOT wrap around. So trying to move a unit left, from the leftmost lane, will NOT move it to the right lane.
Card Pools
Cards are split as follows:
Starter Cards - (13 cards)
Recruit Season - (5 cards); intoduction to what a season pass/battle pass looks like.
Intro Pool [CL 1-4] - (8 cards)
Pool 1 [CL 18-214 currently] - 46 cards
Pool 2 [CL 222-474 currently] - 25 cards
Pool 3 [CL>474] - everything else
Seasonal Cards - Card from the battlepass. They enter Pool 3 roughly 2 months after their release (1 month after their season ends).