I have Kess and As Foretold in play and am attempting to cast a card in my graveyard with Kess' ability and the mana replacement ability of As Foretold, but that is not an option on mtgo.

Auspicious Starrix only put one permanent onto the battlefield when i mutated my creatured even though my created had been mutated numerous times prior.

1. Cast Painter's Servant naming Blue
2. Opponent activates Inkmoth Nexus
3. Opponent casts Scale Up targeting Inkmoth Nexus which resolves.
4. Cast Pyroblast targeting Inkmoth Nexus during Declare Attackers
5. Actual: It lives
6. Expected: It dies

played one instant "Ravaging blaze turn 8" tried to cast "twincast" to copy it and it never let me even have the chance to cast it.
Match number 231726875
Game number 730340440
Need to make it more available to cast the second instant instantly. Before the stack is gone.

I experienced this issue while attempting to splice Splicer's Skill onto a Boulder Rush (Rimrock Knight's adventure). When the spell resolved, the 3/3 Golem was created, but the Rimrock Knight was not put into exile ("on an Adventure") -- instead the card wound up in my graveyard. This happened in match #230064681, games 1 and 2.

Please add hotkeys to navigate the collection so that the owner can go from beginning to end, as well as switch to colors without filtering

Event #231678078
It appears Weather the Storm considers buyback costs an additional spell, not the cost of an existing spell, like Sprout Swarm. In Turn 11, at 11:07 AM EST of the Event, the observer can see the only two spells cast that turn were Sprout Swarm with buyback, and Weather the Storm. This would give a Storm Count of 2, gaining my opponent 3 times 2 Storm Count = 6, not 9 life. I think this is an error.

Casting Peer into the Abyss on yourself with Teferi's Tutelage out in play crashes the MTGO game client if you mill beyond your opponents library

While selecting cards with Doomsday, the opponent can see any cards you're choosing from the graveyard, as they have the green selection outline around them. This leaks information, as Doomsday does not reveal the cards selected, and unless you know your opponent's exact decklist, it cannot be determined from the exiled cards whether or not a given card was chosen.

Steps to reproduce:

Player B puts some cards in graveyard
Player B casts Doomsday
Player B selects some cards from their graveyard
Player A observes that they can see a green outline appear around cards as they are chosen

I cast fire prophecy and wanted to copy it with lutri and it resolved without giving me a chance

Mutate porcuparrot
Tap it to deal damage
Damage dealt is not correct

I lost a round of limited due to porcuparrot being bugged. The creature was mutated two times but when tapped was dealing 4 damage.

Lurrus does not trigger companion with expansion//explosion in the deck. Steps are:
1. Create a deck full of lands and 1 expansion//explosion with lurrus in the sideboard
2. Enter a game
3. Actual: Game resolves mulligans and turns start
4. Expected: Companion should trigger and allow the player to select a companion.

My opponent equiped skullclamp on his wandering fumarole, then we he switched the power and toughness of wandering fumarole it became a 3/2 instead of dying.

During my matches. I could not board cards in which caused me to lose

After being targeted by Merfolk Trickster's ETB effect, Ghitu Lavarunner's power does not shrink to 1. This happened to me twice in this game and resulted in two very bad blocks I was forced to make.

I've made this particular play many times, especially on Arena, and unless I am misremembering terribly, it resulted in the Trickster being able to profitably block and kill the Lavarunner.

I am open to being wrong because layers are complex, but I was 99.9% sure the Lavarunner should've shrunk.