Wild Heroic Tavern Brawl arrives in Hearthstone this week

Hearthstone's biggest challenge is returning.

The ultra-difficult Heroic Tavern Brawl is returning to Hearthstone—and this time, it’s going to be Wild.

Heroic Tavern Brawl, which is a time-limited Arena-style gauntlet, was very popular in its original run, and particularly piqued the interest of streamers and pro players looking for a new challenge.

In the Heroic Brawl, players build a single constructed deck. They are then matched with other players and, like in Arena mode, attempt to win 12 times without losing three times.

The first Heroic Brawl used the Standard format. But with Blizzard focused on a renewed push for the Wild format, where all cards ever released in the game are legal, this time players will build decks using the entire Hearthstone collection.

The price of entry is steep—a single run costs either $9.99 or 1,000 gold. But the rewards are steep too, with 50 packs and three golden legendaries awarded to players who complete the 12-win run. To recoup the cost of entry, players need to rack up at least nine wins.

The Wild format will make the Heroic Brawl a fascinating watch, as accomplished players who generally stick to Standard will have to figure out what to play in Wild. Whether it’s something old—Reno Warlock, Secret Paladin or Aggro Shaman—or something new and bizarre like a crazy Combo deck, players are already scrambling to find the best deck to run with.

Expect to see all your favorite streamers giving the mode a try when it arrives later this week.