I registered for GenCon Online, and am scheduled to play a Legacy Qualifier at 3pm tomorrow. I wanted to get some practice in, and went to the Legacy Tournament Practice area of Constructed...only to find myself unable to submit my deck.
I'm not using any illegal cards, and my deck is listed under my Legacy decks. I'm using only cards that were opened up to me with my GenCon event registration.

Playing modern league, whenever I played copperline gorge it remained untapped, no matter the number of lands in play already (3+). Happened over several matches.

Does not work the way it should with cycle cards. It allows Street Wraith to cycle as a cost and put it on top, which it should not allow. But it does not work with other cycle cards. In certain instances, such as with Vizier of Tumbling Sands and Esper Sojourners, cycling the card does not trigger its effect, even when sent to the yard.

Everytime i use any mutate ability on the token made by Karn the game immediately restarts from turn 1 and the game "catches" up back to the when the mutate occurs it repeats the same thing again

After starting the session and entering a game, starting, mid-game or at the end I get an error and automatically closes the game, preventing me from winning the ranked, as a result of the game closing I lose the game

I just won a game of pauper. But then when I went to find my reward it was not there. Additionally when I checked to see if I even won the game it did not show me that I had won and said I had lost. I clearly won the game and have provided proof. This is not fair for me as I lost play points.

the constructed tab is not showing anything other than 2 player queue, tournament practice and open play for all formats, limited seems to be fine though

Chaos Draft, I steal his creature and it immediately reloads the game twice before starting a new game where both players discard every turn and can't do anything else.

https://www.youtube.com/watch?v=bLahqmXffW8

in the 3 match of the 3th round in the double masters sealed game im playing, I targeted a darksteel axe with Topple the statue and it just got tapped not destroyed (card Says tap target permanent. If its and artyfact destroy it.) i ended up loosing the round because of it.

When I joined the Vintage Cube, I jumped directly to the deck I built previous draft.

I know you can select anytime before hand where your commander will end up "before hand," but this is flawed. Where I may want mu commander to go depends greatly on what my opponent does if they kill, exile, bounce it, etc. this setup can also cause many dumb mistakes, like killing your commander with your own Thasa.

Can it be switched so that when you commander leaves the battlefield, you are then prompted to select where it goes? Like in real life? This would eliminate mistakes and allow reaction to your opponent play

I recently just downloaded MTGO today, so I tried to play a few games of Commander. However, every time I try to join a game MTGO crashes for me. It happens right after the count down. Once it happens I have to try multiple times to log back. It is only successful if I believe I get kicked from the other players, or the lobby closes.

so i just had a game where the other player had no cards in his library and he didn't lose and then tried to get even more card when he had no cards in his draw phase the other play had no cards how did he win the other player had a green and black deck

Zombie trailblazer makes lands into islands when it targets them, not Swamps. I targeted my opponent's plains and he tapped for blue after the effect resolved

i have a krenko mob boss deck that crashes any and all matches that i play in. if im able to make more than 40 1/1 goblins it crashes the match and starts the match over from the begining. this makes everyone in the lobby wait an extra 15 to 20 minutes before we are even able to play again to resume the match. some serious bugs or issues going on here.

el juego se me cierra automaticamente despues de que se actualizo la nueva expasion de cartas alguien ayuda

A player plays time twister with an underworld dreams and spiteful visions on the field. Duel caster mage was then cast to copy the time twister. The triggers from underworld dreams and spiteful visions go on the stack. However the game breaks and causes an infinite loop of the game replay instead of resolving the triggers