During my recent gameplay, I encountered the following bugs which severely ruined my gaming experience.
When I disconnect mid-game due to poor network and reconnect afterwards, I am unable to sideboard and swap my desired cards in BO3 matches.
When I cast spells with abilities like Harmonize, or Rottenmouth Viper, spells whose casting cost can be reduced by certain means. While I am selecting how many of my non-land permanents to sacrifice or which of my creatures to tap to pay for Harmonize, if I click undo, I can neither complete the payment nor revert to the pre-casting state. The game locks me completely and I cannot perform any actions.