1. It is night and Leeching Lurker is on the battlefield
2. Cast 2 spells on your turn so it becomes day next turn(search party captain and curse of leeches)
3. Neither player has hexproof/shroud etc.
4. Actual: Upon Leeching Lurker's transformation it goes to the graveyard
5. Expected: I am given the choice to attach Curse of Leeches to target player, and the enchantment remains in play.

A creature died and I didn't get the trigger off of Morbid Opportunist.

Note ability:
Whenever one or more other creatures die, draw a card. This ability triggers only once each turn.

Katilda's ability is not working correctly. instead of allowing you to tap humans for mana it is instead acting as if it adds flavor text. I have had multiple turns where I could have done many things on my turn (Including using the other ability) but instead it is just flavor text that does not work

Opponent cast multiple siphon insights which always blocked my next draw step draw match id #242838509

I resolved a Living End, putting 2 architects of will onto the battlefield. Upon their triggers resolving, I was shown the top cards of their library but was not given the opportunity to reorder them. My opponent told me that instead they were able to reorder them.

Angel's grace is supposed to keep your life total on 1 when you are attacked for lethal damage. Since the last update, combat damage reduces it to minus life and you lose the game when the turn ends.

I want a full reimbursement because i was winning the match, and because of this bug he got karn out of ancient stirrings and won.

Sylvan Library made the game restart and pass our turns to discard. We couldn't finish the game.

Siphon insight only allows me to see 1 card on flash back. Then prevents my opponent from drawing a card for turn or seeing the correct number of cards off of Memory Deluge.

He played a spell.
I tried to counter that spell with Lofty Denial.
He pay only 1 mana and the spell resolves. I had two creatures with flying in play.

Yet another opponent crashing the game in a limited match due to playing tons of class cards

Tokens generated by god-pharoah's gift are affected by summoning sickness since last MTGO update.

Step 1: Casting Spells and resolves
Step 2: Cards will be revealed.
Step 3: All cards are shown in the temporary zone.

Issue and Step 4: The only card you can order once any of the two spells get resolves is the first one, so THE PROBLEM is you can't order the cards that were revealed in the order you want back into the library.

First Response, the reprint in Commander Legends was not triggering. I was playing Liesa as my commander. I lost life each of my turns after casting First Response without it triggering once during my or any other upkeeps.

I tapped Wellwisher to gain lives and I gained like 550 life points during game #774495838 of match #242796622 of Pauper League #6107.
My opponent conceded the match after this.

A bug occurred while an opponent was resolving a Sylvan Library trigger.
The game rewound and it was difficult to continue.

Ever since the last update (which I think was today: 09/15/2021) the triggered ability isn't allowing me (the owner of the effect) to rearrange the opponent's library. I tested the effect on the opponent's library 3 times and it didn't allow me to choose the order of the cards. When I tested it on myself it allowed me to change the order of the cards.

Game two I had cast an Abundant Growth on my Breeding Pool turn one, and my opponent cast Blood Moon on turn 3. My Breeding Pool would only tap for red, and it cost me the game. This is a bug that has been around for a long time now, it really should be fixed. Abundant Growth is one of the ways for green decks to combat Blood Moon, and that is not something we haven't been able to do for some time now.

declared blockers, then tried to activiate Thopter foundry using Milikin to pay mana cost. Told me to select a non token artifact, but would not accept any highlighted entry and could not proceed with game.