I had a Primal Empathy in play and my opponent had a larger creature on the battlefield. Primal Empathy drew me a card instead of putting a +1/+1 counter on my creature.
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My opponent attacked me with a warrior and triggered Ancestral Blade's triggered ability, and paid the one generic mana. The equipment didn't equip as described.
I created a copy of Johann with Dollhouse of Horrors, and I couldn't look at the top card of my library with it for some reason. Notably, Johann's ability works when the card isn't a token.
I attempted to activate the ability of the card "Startled Awake", and the game stated it couldn't return to the battlefield because it "wasn't a permanent". Pretty sure it's a bug.
My opponent told me that he saw the Writhing Chrysalis that I took with Planar Genesis, and I believe that information should only be at my discretion.
I cloaked the top card of my opponent's library with Etrata's ability, which was a dramatic accusation. Since that permanent can't be turned face up according to the mechanics of cloak, it should be exiled and I get to cast it for free. Instead, the dramatic accusation went right into the...
I'm currently playing Vintage Cube, and I'm pretty sure I had a bayou in my draft pool that vanished while I was making the deck. I thought it might have been my imagination, but sure enough, I counted the cards in my pool, and only had 44.
My opponent gave their Civil Servant vigilance, and it was able to give itself lifelink, which it shouldn't be able to do, I believe. It says "tap another untapped citizen" on the card.
Dredging Claws won't auto equip to Gravecrawler when it enters the battlefield from the graveyard. I could be wrong with this ruling, but I'm pretty sure it needs to be fixed.