Star Compass - previously reported bug, incorrect calculation of colored mana it gives in some cases. I've reported it
here.
Teferi's Puzzle Box - previously reported bug, player asked in which order to put cards into AI's library.
Mesmeric Orb - every single milled card opens it's own window. Considering orb's milling potential, it should show all milled cards at once or doesn't show at all. Same thing with
Uba Mask, it probably shouldn't reveal drawed cards one by one, but all at once.
Summoner's Egg put
Bringer of the White Dawn in play, next turn Bringer's ability returned egg and egg put
Arcbound Fiend in play. After that Bringer was turned face down for the rest of the game.
Scrounge's artifact search can be canceled.
Shared Fate issues. 1. It doesn't allow to cast flash/instant cards at any moment. 2. If casting of the spell was canceled, it will remain exiled and uncastable for the rest of the game. 3. It was a while ago, don't remember the exact details so I might be wrong on this. Permanent was bounced in hand, and then right away exiled like it was a card draw, but without any actual cards being drawed.
Kiki-Jiki, Mirror Breaker's created Zubera token have it's ability triggered 2 times once it's sacrificed.
AI's
Angelic Page used his ability for free while I had 2
Suppression Field.