Hearthstone Strategy Guide: Boomsday Nerf
Giggling Inventor got Silenced

A couple of weeks ago, Blizzard made a long-expected nerf to Giggling Inventor. It was in almost all the top-tier builds, and Blizzard hate that, so it got a cost increase to seven mana.
Less expected were some other nerfs. Mana Wyrm, the staple play of most Mage builds, cost a one point increase. Druid Legendary Avaiana also got a cost increase due to some broken Wild format builds.
Changing such a ubiquitous card has impacted the meta a fair amount. Not just because most decks needed a replacement, but because tech cards to deal with it are no longer needed. We've updated our guides to take this into account. Here's the current top-tier builds.
First, don't forget that since Giggling Inventor was an odd-cost card, it doesn't affect even builds. So Even Shaman and Even Warlock are still in the top-tier and haven't changed at all.
Odd Paladin
Removing a mech has shifted this whole deck back toward it's aggro Paladin roots. It's now all-out attack again and still horribly powerful. Throw down a sea of minions and then use mass buffs to destroy the opposition.Odd Rogue
Removing a defensive card has, unsurprisingly, been a blessing for aggro decks in general. But Odd Rogue has changed more than most, because old builds used to run Blood Knight. Not only was this a counter for enemy Giggling Inventors, but it could feed off your own too, to make a massive minion. The revised version is still big on aggro, but includes Tar Creeper to help save you from enemy aggro builds.