A couple of Hearthstone hotfixes have gone out to fix issues with the 18.0 patch.

  • Transfer Student adds a random class card to your hand when used on the new Scholomance Board. (Temporary, will be dual-class after expac launch)
  • Magnetizing Missile Launcher and Venomizer will no longer cause the game to freeze.
  • Casting Spreading Plague will no longer cause disconnects.
  • [BG] Mr. Bigglesworth fixed to no longer sometimes:
    • Offer a golden minion during recruit phase.
    • Offer one less minion during recruit phase.
    • Offer one less minion as a Discover option.

Quote From cmdylux

Good morning everyone,

We’re currently deploying a hotfix that will address the following issues introduced with the 18.0 patch:

  • On the new Scholomance Academy board, Transfer Student’s Battlecry will now add a random class card to your hand. This effect will revert to adding a random Dual-Class card to your hand when the expansion unlocks on August 6.
  • Magnetizing Missile Launcher and Venomizer will no longer cause the game to freeze.
  • Casting Spreading Plague will no longer cause disconnects.

All these fixes will take place on the server side, so you will not have to download anything if you’ve updated to 18.0. (Source)

Hey everyone,

We’re currently in the process of deploying another hotfix that will address the following Battlegrounds issue:

  • Fixed a bug involving Mr. Bigglesworth where players would sometimes be offered a golden minion in the Recruit Phase, one less minion in the Recruit Phase, or one less minion as a Discover option.

This fix will take place on the server side, so you won't need to download anything if you’ve updated to 18.0. (Source)