You should public declare how the shuffler works because lot of players complain about it.
Read the comments left to the app…

I run go-shintai shrine tribal in historic brawl. The deck runs 36 lands. The algorithm that "randomizes" my hand has been giving me two lands in my starting hand with annoying regularity, several times I've had to mull down to 0 and it still won't give me more than two.

Make your algorithm truly random. Don't force a balance in my hand I don't want, this has never happened with the paper copy of it I have.

Here are a couple of times I remembered to screenshot the hijinks.

Please, please, implement a way to opt out of the hand-smoothing and matchmaking algorithms. I've been tracking my games and I lose way more to the shuffler than to my own mistakes/opponents. I get hands that start with two mana and then no mana til turn six while you are drawing all the most expensive cards in your deck, or hands that start with 3 and boy those other 4 better be good because you have 5-6 lands on the top of your deck to fight whatever your opponent gets. It's like you want to remove needing to understand math and probability out of the game and make sure it's dumbed down enough for everyone. Problem is, that fundamentally changes the game for the worse (doesn't even feel like real Magic, more like a competitor knock-off) and makes veteran players who in some cases (like myself) have almost 30 years of experience building decks, supporting YOUR game and money-maker want to walk away from this platform. I'd rather go back to playing on busted third party unofficial platforms that at least offer random matches and random shuffling as opposed to your "curated to remove the need for intelligence" style of matchmaking and shuffling. At this point, it is OBVIOUS to everyone that this is a terrible system. Please, if you're so fond of the algorithm, at least allow players to opt out of it so you guys can still milk the people who can't add or cipher probabilities for themselves while still letting those of us who can do math to enjoy the game as we do in paper. You don't get to hand select or get paired with people based on what you and they are playing, again this is not native to Magic the Gathering and fundamentally changes the game for the worse. Please, don't kill this game to make a buck. They've already done that with the environment and people's minds, not Magic too, please!!

I can't agree more with Mystic Squid (previous comment), I've been tracking my games and I lose way more to the shuffler than to my own mistakes/opponent. I get hands that start with two mana and then no mana til turn six while you are drawing all the most expensive cards in your deck, or hands that start with 3 and boy those other 4 better be good because you have 5-6 lands on the top of your deck to fight whatever your opponent gets. It's like you want to remove needing to understand math and probability out of the game and make sure it's dumbed down enough for everyone. Problem is, that fundamentally changes the game for the worse and makes veteran players who in some cases (like myself) have almost 30 years of experience building decks, supporting YOUR game and money-maker want to walk away from this platform. I'd rather go back to playing on busted third party unofficial platforms that at least offer random matches and random shuffling as opposed to your "curated to remove the need for intelligence" style of matchmaking and shuffling. At this point, it is OBVIOUS to everyone that this is a terrible system. Please, if you're so fond of the algorithm, at least allow players to opt out of it so you guys can still milk the people who can't add or cipher probabilities for themselves while still letting those of us who can do math to enjoy the game as we do in paper. Please, don't kill this game to make a buck. They've already done that with the environment and people's minds, not Magic too, please!!

There is no hand-smoothing in Best-of-3. Perhaps its time to play the real version of MTG and ditch BO1?

I too tracked my games. THIS IS NOT BIAS. in my very first day of tracking games, i went first 22 times and second 41 times. i have played every day for a month and tracked all of my games. so far, i went first 522 times and second 622 times. there was a streak where i went second 13 straight times. on the other side of that, the most i went first was 6 times straight and i was absolutely stunned to go first that many times in a row...

Hello, I already quit the game before because of this and I just got back and tried to see if this is fixed but it still isn't

It seems all my hands are always fixed to be bad, I keep getting bad draws and this makes me lose very often. Im not a bad player and in rel life I dont have this issues, it is just some algorithm in Arena that is making this. I spent too much but Im not willing to spend any more if you keep having this behavior.
Regards

Matchmaking is so BROKING! I won't say anymore because everyone already has stated what needs to be said. This is absurd and absolutely unenjoyable. Please fix the fixed matchmaking. It is so rigged it hurts....

Your shuffler needs to get randomized, I can send you my deck list and I can tell you which card , if I get it in my opening hand I don't have a chance . This is not a conspiracy theory. I have recorded the statistics for several hundred thousand games and every single time I get flooded with mana to the point that on average my first 10 - 15 draws will be only lands. If your shuffler has such apparent patterns maybe you should change it. I can also prove that your shuffler does favor specific deck arch types. Another thing I would like is the contact info for someone that can actually do something to address my issue as you guys are just going to feed some BS scripted garbage if you respond at all. I have a petition started that has a few thousand names of players who want the option to turn off hand smoothing for themselves. If you just ignore me I can release my findings publicly and let the community decide for themselves if arena is worth paying into.

It is not the first time it happens, it is maybe a bug or a hack, 7 draws.... 7 lands in a deck of 19 lands.... call me crazy, but the chances of that happenings once are very few, but 4 or 5 times it seems a hard problem.

I want to know who out there is getting to go first most of the time to make up for the fact I get to go second at least 8/10 matches. I've lost so many games to going second that it really is beginning to irk me after these years. This is not a case of "you only remember the negatives", I am honestly gobstruck when I get to go first.

I just wish that going first didn't mean so much to the game.

Is Wizards of the Coast trying to kill Magic the Gathering? Arena is garbage. Fix the **** shuffler! Quit giving people whom give you money an unfair advantage. We all know you're cheating for the people that pay you money.

I have a great Idea - how about you stop manipulating the game in the background. Stop with the " hand smoothing " fix the matchmaking and I don't know what to say about the " shuffler ". The game is a complete festering pile of burning garbage. How's that for a great Idea? Probably not going to happen as it seems WOTC is just bent towards separating morons from their money. Buying worthless pixel products. No value

Update; guess what? Here we go again. I lost *three games in a row* and i get this.

There is 0 reason under this sun to match me, a low level plat player, against #265 in the whole game. I do not *care* how many games i won beforehand (spoiler alert, it was 2) I should have never even seen this person unless I am that good. And I'm not. My ranked dropped 2 slots for this. And customer supp says AlGoRiThMs ArE WoRkInG aS iNtEnDeD.

One Legion Angel in the deck but always draw it in the first 15 cards, always. Not just my opponents but me as well. Want logs? I have logs. It works out for me but the opponent as well. Fix your shuffler, we're tired of your... compost (trying to be PC and not trigger you).

Explorer also.

Bro, this game is an absolute JOKE. Pure scamming, outside ANY probabilistic logic.
There's an ENORMOUS BUG in the shuffling algorithm and you are taking money from people who trust you and think it's "randomized". Pure scamming.

How strange it is, that you have a VERY solid draft deck on Platinum, you go 3-0 against players ranked higher than you and then, suddenly you find yourself 3-3 with the last 30 draws where you draw the 95% of lands in the deck.
From a statistical point of view this is near to impossible, but for Wizards of the Coast this seems to be regular stuff. Deliberately biased algorithm to cut down who ranks to fast.
But hey, don't worry, I bet antitrust and gambling authorities will soon pay a visit to you. ;)