The card was Life of Toshiro Umezawa. The Black Saga for 2 Mana. I couldn't click the same Mode again.

Any time Faithbound Judge or Sinner's Judgment triggers, the game gives an error message and crashes. This immediately makes it impossible to continue playing the match, and seems to consistently occur every time the trigger resolves.

I cast Sphere of Annihilation with 6 counters on it. I allowed a turn to pass and the sphere triggered on my next upkeep. the sphere exiled itself, but the other permanents it should exile with the sphere, did not get exiled. this bug cost me the match. both my opponent and myself were baffled by the failure of the sphere to trigger correctly.

1. I put Kaya's Ghostform on my Perilous Myr.

2. I sacrifice it.

3. Perilous Myr's trigger goes off but Kaya's Ghostform doesn't trigger.

4. Kaya's Ghostform successfully triggers and brings back the Perilous Myr.

Event # 246511225
Game # 789266100
Match # 246511255

Turn 8
Opponent blocks [Spring-Leaf Avenger] with [Atsushi, the Blazing Sky] that has [Leech Gauntlet] attached to it. I cast [Return to Action] and target [Spring-Leaf Avenger] in response. Both creatures die however [Spring-Leaf Avenger] gets exiled instead of returning to the battlefield.

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.

Connive does not make you discard when a hullbreacher is in play. The opponent gets the treasure from hullbreacher, but you are not asked to discard a card to connive.

It is bugged in many ways and appears to simply not prevent ETB triggers from other cards occurring as it is supposed to.

Aurelia, the Warleader triggers on her second attack resulting in 3 combats

Attempted to use Shigeki's Channel ability to retrieve X non-legendary cards from the graveyard on main phase, but was unable to while i had the appropriate mana to do so. I had used his first ability to put those cards into my graveyard with the intention to get them back.

chains glitches, just doesnt allow you to draw any cards and doesnt make you discard or mill

Conspicuous Snoop has all activated abilities of all cards on top of the library

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

After attacking with Armored Skyhunter it seemed to cause two of my other creatures to disappear from the game. They didn't even end up in my graveyard or exile zones.

Round 1, Game 1: I controlled a Chandra, Torch of Defiance, and my opponent used Wild Slash to deal the Chandra lethal damage while controlling Etching of Kumano. I believe that the creature's ability, which is supposed to cause creatures dealt damage to be exiled, wrongly applied to my planeswalker. The Chandra was exiled, which caused me to not have enough cards in my graveyard to escape Kroxa, Titan of Death's Hunger, thereby affecting the outcome of the game.

I tried to use its ability during a slow and grindy match , mtgo was sluggish, but it sacced to itself. That is a bug, it should only allow to sacrifice another creature as i intended anyways.
So it sacrificed my creature that says , sacrifice "another" creature. Itself should not happen since its not a legal game process.

Karn the great creator, made my damping sphere a 1/1 instead of 2/2

I exiled my own Queza that was enchanted with Witness Protection to the effect of my Lagrella, the Magpie.

When the Lagrella left the battlefield, the Queza that returned did not get two +1/+1 counters like it was intended to.

Expected:
"When Lagrella, the Magpie enters the battlefield, exile any number of other target creatures controlled by different players until Lagrella leaves the battlefield. When an exiled card enters the battlefield under your control this way, put two +1/+1 counters on it."