The outlined features are ordered by my personal feel of importance, descending from high to low; top to bottom.
In-game Chat Lobby
With chat implemented, having an in-game chat lobby is the next step in providing more enhanced social features. There's just so many ways a lobby would help the game. If implemented, having player creatable channels would be nice; for example, a guild making a channel under their name.
Game Chat History
With the game designed with mobile in mind, players aren't glued to the screen of their mobile devices at all times and need a log kept of the chat history for their matches.
Resuming Disconnections
There are many reasons players accidentally get disconnected; client crash, device crash, unstable internet connection, incoming call on the AT&T network since you can only get either data or voice at a time, etc. So players should be allowed to resume the game, within a certain amount of time, after they've inadvertently left.
Multiple Deck Save Slots
A simple feature simply requested many times. Building decks is a major part of the game and players want to be in control. Players should be able to name and rename their decks, copy decks(taking up another save slot), and delete them.
Custom AI Deck
When players want to tweak their deck and they don't have anyone around to help, a good solution is having the AI play your deck to help you tweak it. Newer players usually don't have the luxury of someone to help playtest their deck. And some players just prefer the convenience of using the AI to tweak their deck.
Animation Toggle
This is one of the hotly requested features. Particularly on lower-end devices, this will really improve player experience by having the game run better. Default should be on with, hopefully, detection of lower-end devices and having it off for these.
Replay Privacy Options
Even Facebook had to bend to requests for better privacy. Players want to be able to control if a replay is public or not. You should be able to toggle this option during a match and if either player toggles it off, the replay should be private—meaning the replay only shows up and is watchable for the two players. An option in the Settings menu to set the default to on or off would be nice. On a related note, players want to be able to view their hand faced up when watching their own replays.
Mulligan
Mulligan your hand is strategic and adds a level of depth to the game. Usually this involves discarding your hand and drawing one less card. This feature was requested numerous times even when the 40 card deck size minimum wasn't announced and is a nice feature to have once that change is implemented or raised higher in the future.
More Multiplayer Modes
Local network and Bluetooth. Because not all players have internet access at all times so allowing them to play with friends even in those cases is certainly a good thing.
Messaging System
Socialization can drive many things and having the ability to chat with people in the game, when you're not playing a match with them, will improve play experience.
Interface Improvements
The current interface suffices; however, when players play the game, one of the things they spend much of their time on is the interface of the game so this should be streamlined so players can spend more time enjoying the game.
• During multiple targeting of multiple targets, single taps to select targets and then tap on the Done button to acknowledge; rather than redundantly clicking on the Target button for each target.
• Swiping left and right when viewing cards in your hand only works with camera angle 1; not 2 or 3.
• Swiping to the left shows you the card to the right of the current card; shouldn't it show the card to the right?
• Swiping left and right doesn't work for viewing cards in your currently selected deck on the Deck screen.
• Swiping left and right doesn't work for selected cards in the Buy and Sell screens of the Merchant.
Campaign Mode Card Rewards
The original PC version of Magic that came out in 1997 had card rewards for pretty much all battles in campaign mode. After defeating the deck, you could pick a single card from the opponent's deck.
Deck Import/Export
Much revolves around decks when the game's a TCG. Giving convenience by allowing export of decks to text will allow easier sharing and backup of decks. Having the option to quickly import decks let players discover and try out more decks.
Viewable Sacrifice Pile
The Graveyard will be viewable in v1.27 but being able to view the Sacrifice Pile will be a fundamental step before implementing asynchronous multiplayer.
In-game Forgot Password
While the option is available on the support page, it's much more suited in-game, on the login screen. This is fairly standard.
Profanity Filter
People will swear. People will get offended. People will report. A filter won't change the aforementioned but will reduce the amount of chat related reports and reviews that need to be done. The volume of this is low now but the future should be accounted for.
Out of Stock Label
Mostly newer players but many newer players inquire about out of stock cards. Cards that are out of stock should be kept in the Merchant but labeled as out of stock.
Play Acknowledgement Toggle
Now that players are more used to auto-acknowledgement of played cards in multiplayer, they miss this against the AI. Players also requested the ability to turn this off in multiplayer because, for example, when they're teaching the game to someone by playing a game with them, the newer player has a hard time learning when played cards zoom out right away.
Volume Controls
Stock feature for most programs. Specifically, the controls would be, toggle for music, toggle for sound effects, and volume sliders to adjust loudness.
In-game Account Reset
If this one is implemented, players need to be clearly informed, verbatim, what this will wipe out.
Verbose Game History
Another feature to facilitate asynchronous multiplayer. This basically involves a viewable console logging verbosely, the history of the game; such as which cards are played, which card targeting which card, etc.
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