Shudderwock

Active Hero Power "Bizarre Shriek": 0 Gold, trigger a friendly minion's Battlecry (unlocked on turn 3). Current armor: 10, win rate ~48.1%. Buddy "Sludge Tosser". One of the original Battlegrounds heroes (launched in Patch 15.6, 2019). Core idea: pair with Brann compositions (Elementals, Murlocs, etc.), keep a Tavern Tempest or Primalfin Lookout on board and use the Hero Power each turn to trigger its Battlecry for free — zero-cost extra resources. The 0-Gold, once-per-turn Power is essentially a free Battlecry trigger, yielding extreme value in Battlecry-dense builds. Was once banned from Beast lobbies due to Leapfrogger combos; restriction lifted in Patch 34.2.2.