Server-Side Hotfix For Cards Crashing The Game After Patch 18.0
Blizzard just announced a server-side hotfix addressing cards crashing the game after patch 18.0 release. This patch is currently being deployed.
Quote from Blizzard
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.
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.