A New Year Bash


 * "The party is here! Work together with another player to decorate the tavern and kickoff a grand New Year of Hearthstone."

A New Year Bash (previously known as A Mammoth of a New Year) is a Tavern Brawl. It made its debut on March 29, 2017.

The fourth cooperative Tavern Brawl, this Brawl was part of a three-part series of special Tavern Brawls which celebrated the start of the Year of the Mammoth. This brawl was again released a day after the release of The Boomsday Project expansion in 2018, and again on Christmas day in 2019.

Changes
The fourth reprisal on December 30th, 2020 gave both players a new deck. It also changed the mechanics of the brawl, making the opponent and all their minions (aside from Party Crashers and Piñata Golem) untargetable with minion attacks and harmful effects.

Known bugs

 * An instant killing of Piñata Golem (e.g., with Poisonous minion, The Black Knight, Natalie Seline) causes the game to softlock.

Overview


This cooperative Brawl revolves around decorating the tavern while fighting with Party Crashers and a Piñata Golem boss. One player will play as druid, and the other as rogue.

This Brawl can be described as having two stages:
 * Stage 1 - Both players are able to use their Hero Power to decorate the tavern. Party Crashers begin spawning at the start of the second player's second turn, ruining the fun.
 * Stage 2 - After decorating the Tavern with 25 pieces, the Piñata Golem boss appears and the players' Hero Powers are changed to Pelt. The piñata boss is able to use two abilities to destroy players' minions: Something in the Punch and Noise Complaint. Hitting the piñata will give candy cards, such as Rock Candy and Divine Sweets, to help players defeat it. After crushing and defeating the piñata, both players win the Brawl.

Piñata Golem

 * Boss


 * Cards

Strategy

 * Mulligan for mana ramp and any cheap minions.
 * There is a limited amount of healing in both decks, so Circus Medic is not worth being corrupted in most cases. Also, since she is the best health-restoring minion in this Tavern Brawl, he is one of the best targets for spells like Sap and Shadowstep.
 * The second phase can be easily ended by getting Turalyon, the Tenured or Violet Wurm after using Cenarion Ward. Turalyon will neutralize Piñata and instantly end the fight, while Violet Wurm will help in a case of the full board (see below for more details).
 * The first stage can turn into an easy walk (safe preparation for Pinata) instead of constant struggle with two and more Party Crashers. To do this, it is enough to completely fill your half of the board, which will prevent the appearance of Party Crashers.
 * The only difficulty is that must be done during your turn. Remove the Party Crasher with a spell and fill a free space with the minions. Druid can do it by Naturalize or Lunar Eclipse; Rogue can use Sap or Shadowstep. Mutual assistance is possible with Terrorguard Escapee or Ogremancer, if the players do not use the summoned minions for trades with Party Crashers.
 * If you press Decorate and reach 25 decorations, make sure by the end of the corresponding turn, there are no more than 6 minions on your board. Otherwise, they are all will be killed by Piñata Golem.
 * If Piñata Golem kills the entire board, and there was a Violet Wurm among the seven minions killed, this will cause Piñata to destroy himself, causing both players to win the fight. This may be because Piñata checks for occupancy space before checking for minions summoned from the resolution of Deathrattles, which are triggered from Piñata's Noise Complaint.

Trivia

 * The Piñata Golem was the first Tavern Brawl Boss to include Taunt in its card text, unlike Gearmaster Mechazod or Nefarian.
 * This Brawl takes place on the Stranglethorn battlefield, decorated with party banners and stringed lights. In the third reprise of this cooperative brawl, the battlefield was not decorated.
 * Before its official release, this Brawl appeared on some streamers' gameplay when they were at the Bahamas to attend the HCT Winter Championship.
 * Damage inflicted by Party Crashers counts toward the "Beat Down" quest, which requires dealing 100 damage to the enemy hero.
 * Some of the Tavern Brawl cards played in this Brawl count towards the quests which require playing Shaman class cards.
 * For the second reprise of this cooperative brawl (named "A New Year Bash"), a death animation played on the teammate's hero when both players won the game, whereas in the first reprise (named "Mammoth of the New Year"), there was no death animation for the teammate's hero portrait.
 * For the third reprise of this cooperative brawl on December 25, 2019 (the second reprise of the name "A New Year Bash"), there was no longer a death animation for the teammate's hero portrait when both players won.