And with that there's a new spell-focused minion type being introduced based on the Naga, which will be a permanent fixture of Heathstone moving forward. Voyage to the Sunken City is first expansion for 2022, and will introduce 135 new underwater-themed collectible cards when it releases on April 12.

Here's the announcement cinematic, which features some truly upbeat backing music.

Calling all adventurers! We’re preparing for an underwater expedition down to the ancient city of Zin-Azshari. The long-lost city is home to beautiful sights and terrifying danger. Look out for Colossal sea creatures, schools of ravenous swarmers, and the territorial Naga. Brave this danger and who knows what mysteries you’ll Dredge up from the depths! Secure your snorkel and fasten your flippers. Soon, we will depart on our Voyage to the Sunken City.

And with that Blizzard has also revealed two new Keywords coming with the new expansion: Colossal and Dredge.

Colossal are new types of minions that summon appendages (in card form) when played. Appendages that will "synergize with their main body in powerful ways". Dredge is an interesting one in that it lets you scour the depth of you deck to raise some sunken treasure to the surface. Translation, take a card from the bottom and place it on the top of your deck. Plus there's also a Sunken mechanic that it can work with.

Blizzard is going to be revealing new cards between now and release so stay tuned to this page to get the full details.