Necra Sanctuary trigger abillity doesn't work properly.
When it triggers, and i have a white permanent and a green permanent, my opponent loses only 1 life, but he should have lost 3 life instead. Even if i have a multicolored permanent, that have both colors, green and white, it still doesn't work properly.
I try to build a deck around this card, but i can't play with the deck properly because of this problem,

Play Lobby Disconnection/Dropped

Vizier of Many Faces was in my graveyard. I paid the 3UU to embalm it, and clicked Massacre Wurm as my choice to be copied. The prompt on the left then told me to pick a creature, and instead of the Yes / No buttons, there was only a No button. I clicked on different creatures a few times to see if anything would change. The art on Vizier changed, but it still wouldn't let me click Yes. With no other option, I eventually gave up and clicked No. The Vizier then went to the graveyard without copying anything.

tree of perdition restarted the game

I've been playing vintage cube last week and I've been met with an annoying problem. Sometimes when I pass priority or want to click OK, the client lags but my timer goes down. This usually takes 20-30 seconds before going on. It happens several times in a match which can cost me up to 4-5 minutes of my clock.

Ceta Sanctuary does not recognize second state

I cast 2 aether gusts targeting my opponent's spells (lightning helix and lightning bolt). I did not know where he put them (whether top or bottom) and had to guess.

MTGO won't allow sign on saying "out of date version. please close client and restart to downloaded latest version" which is followed and no new version has been downloaded. I've attempted uninstalling and re-installing and still run into the same error while attempting to sign in. I've tried rebooting the computer and the same issue happens.

Since the new update with Companions and Ikoria. Selvala, Explorer Returned Resets the Game when you activate her parley ability. After activating her tap ability the game pauses for a moment, and then crashes showing you everything that has progressed through out the game. If you wait through the entire replaying of the game to try and activate her again. It again restarts the game and you have to try and watch the game once more.

This is very troublesome since this is my commander.

Opponent played Ravenous Chupacabra which resolved.
Opponent targets my Walking Balista with the etb trigger from Ravenous Chupacabra.
I activate the ability on Spellskite to redirect the trigger from Ravenous Chupacabra to target my Spellskite.
The ability from Spellskite resolves.
Chat log read "Spellskite cannot change the target of Triggered ability from Ravenous Chupacabra".
Trigger from Ravenous Chupacabra resolves.
My Walking Balista dies to the trigger from Ravenous Chupacabra

I was playing and Magic Online suddenly crashed and I pressed the buttons in an attempt to get back. It turns out that the game recorded what I pressed and still crashed. When I came back to the game, after reopening Magic Online, he understood that I "pressed" the buttons even with him frozen and that cost me the game.

Mutual Destruction bug

I was playing a draft and my game has been bugged from Tree of Redemption, after playing it and actived the ability my game start doing crazy things and I can't lay nopthing after this...

I'm unable to log in to MTGO, I'm receiving a message that says MTGO is down for scheduled maintenance or is otherwise unavailable and I'm unable to log in to the client. I've checked the server status page and can see that the server is live.
So far I've tried updating the client, uninstalling and reinstalling the client but I'm still encountering the same issue.

Ana Sanctuary's 5/5 effect did not work even with both blue and black permanents on the battlefield.

Simply unable to cast my companion, the card itself isn't showing up and when I click the companion space that my mouse is hovered over in the pic, nothing shows up anywhere.

game glitches out when exchanging life total with tree of predition to 1 life.

Steps to Reproduce
-Tree of perdition in play
-Play Biomass Mutation for 3, causing all creatures I control to have base stats of 1/1
-Tap Tree of perdition to switch its toughness of 1 with other players life total
-Game begins to replay the entire match in fast forward twice until the match restarts