Top two feature requests I'd have would be:

1) An AI mode to farm in. Right now the only way is to quickplay, and that swiftly leads to playing against people with better decks. Losing because the other player has a parade of rares you'd like but don't have is pretty frustrating.
2) Some way to transmute one's collection. For example this could be "turn any three mythic rares you have into two mythic rare wildcards". As it is, after locking into a deck one can hardly switch without spending some serious money.

It would be awesome if you could have something like a lab where you can try how cards interact with each other before you burn WC. -Metallic Mimic I'm looking at you-

Now that you mention it, I'd also like a sandbox mode where you have every card in the game, played against the AI. It lets you test decks before committing the money to it. For example in the constructed sub-forum right now there're weird decks like a fog/mill deck which is not likely to be competitive, but could still be interesting. Without the ability to test things in a sandbox though, it's a big investment to sink wildcards into a deck that likely won't go anywhere, discouraging brewing. The litmus test of any brew would be against other players with top decks of course, but one can still learn a lot like "is this curve good?" or "is this card playable?" against the AI.

If Wizards is concerned about how this might damage the economy, then simply make these games to be for no rewards.

Boy the auto-tap-for-mana algorithm needs to be improved. I've screwed myself over so many times by not manually clicking. Sometimes it's really obvious how to tap also - e.g. my hand is two red cards, the auto-tapper still taps my red sources ...

Also the "end turn" slider should be interpreted as "pass till end of turn". So annoying to have to click through all the "resolve" triggers when I have the slider on.

Yeah, I had 3 plains, one forest, and a 1W creature and Blossoming Defense in my hand. I played the creature and it tapped a plains and the forest. I mean, cmon now.

Could really use a way to turn wildcards from one type to another. I have lots of spare uncommon and common wildcards, not to mention three mythic rare wildcards, but need like 7+ more rare ones to complete the R/B deck.

RIP two-colour manabases with all the duals @ rare ...

I think the rare bottleneck does a lot of good work. Right now you can spend common/uncommon/mythic WC on whatever wacky jank you want to try out and only save your rare WC for your "serious business" decks. Even if you waste your mythics you can be sure that you will have a few more extras in a bit.

i want more stories of Vert getting screwed awesomely by auto-tapping lands. I love it.

Meh... auto tapping.
Have had it turned off since day one.
I don't trust those damn machines!
Get off my lawn!

auto-tapping brutally murdered my father a week ago and now i can finally joke about it.

I'm about to murder FedEx
Their driver lied and said we weren't available and package couldn't be delivered. My wife has been hanging around outside all day for her tablet and a FedEx driver never even drove through our neighborhood.
I'm on the horn with them right now and pissed.
Sorry, off topic.
Did I say I'm pissed?

hmmm... pics of the wife or it's not real

Hehehe. I'm not going to up a pic of her.
Been together 22 years, married for 13, have a 12 and 10 year old soon to be 13 and 11.
LoL
Picture

lol, trying to either make you laugh or redirect your anger. Either way you win!

Thanks
Yah, that got me smiling.
I complained to FedEx and I have grievance attached to the tracking number so if I don't get it tomorrow some action can happen.
Short story. My son broke his moms tablet screen but I had purchase 2 year replacement plans on all their tabs so......
.....it wasn't fun getting the proper replacement... FedEx said they delivered the original replacement on the 2nd... nothing here... back on with Wally World and they issued us a replacement tablet that was supposed to arrive today.
Jesus guys I'm sorry for ... **** I'm still typing!!!

You know what?
Time to play some Arena before bed time. Sounds like the kids and wife are in the living room watching Bad Lip Reading on YouTube on the Big Screen/Theater Sound.
I'll just chill back here in my bedroom and do me a nice one hit, play a few games and have a nice little sleep.

I want two new emotes. "Sorry" and "Thank you"

I have been amazed and yelled about not having a Thank You emote from the beginning.
What, are we self absorbed savages???

I don’t see any use for those except BM
“Sorry for rearranging your face with my Ghalta a bit”
“Thank you for that derp, I really needed it. Btw you are dead”

lol that last one would be great