Patch 16.6.0.43246 is a Hearthstone patch released on March 17th, 2020. It is a large patch, adding 
Kael'thas Sunstrider and Lady Vashj to the game, reverting the nerfs of Sludge Slurper and four Wild format cards, and adding many large changes to Battlegrounds.
Patch notes[]
Card changes[]
- Spiteful Summoner
- Old: Costs 7 mana → New: Costs 6 mana.
- Call of the Wild
- Old: Costs 9 mana → New: Costs 8 mana.
- Lesser Emerald Spellstone
- Old: Costs 6 mana → New: Costs 5 mana.
- Raza the Chained
- Old: Battlecry: If your deck has no duplicates, your Hero Power costs (1) this game. → New: Battlecry: If your deck has no duplicates, your Hero Power costs (0) this game.
- Yogg-Saron, Hope's End
- No longer stops casting when he leaves the board.
- Sludge Slurper
- Old: 1 Attack / 1 Health → New: 2 Attack / 1 Health.
Battlegrounds Hero Pool updates[]
- Ragnaros, Sylvanas, and Patches have been removed from the pool.
- NEW HERO - Fungalmancer Flurgl added to the pool.
- Gone Fishing:
- [Passive] After you sell a Murloc, add a random Murloc to Bob's Tavern. (of the same Tavern Tier or lower).
- Sir Finley Mrrglton added back to the pool.
- Adventure!:
- [Passive] At the start of the game, Discover a Hero Power.
- Professor Putricide added back to the pool.
- Rage Potion:
- [Cost 1] Give a friendly minion +10 Attack for the next combat only (targeted).
Battlegrounds Balance Updates[]
Heroes[]
- The Lich King
- Reborn Rites:
- [Cost 1] Start of Combat: Give your rightmost minion Reborn. → [Cost 1] Give a friendly minion Reborn for next combat only (targeted).
- Ysera
- Dream Portal:
- [Cost 1] Refresh and add a Dragon to Bob's Tavern. → [Passive] At the start of your turn, add a Dragon to Bob's Tavern.
- Pyramad
- Brick by Brick:
- [Cost 1] Give a random friendly minion +3 Health. → [Cost 1] Give a random friendly minion +4 Health.
- Millhouse Manastorm
- Manastorm:
- [Passive] Minions cost 2 Gold. Refresh costs 2 Gold. Start with 2 Gold. → [Passive] Minions cost 2 Gold. Refresh costs 2 Gold. Start with 3 Gold.
- The Rat King
- King of Beasts, Mechs, Murlocs, Demons and Dragons:
- [Passive] Whenever you buy a Beast/Mech/Murloc/Demon/Dragon, give it +1/+1. → [Passive] Whenever you buy a Beast/Mech/Murloc/Demon/Dragon, give it +1/+2.
- Milificient Manastorm
- Tinker:
- [Passive] Mechs in Bob's Tavern have +1 Attack. → [Passive] Mechs in Bob's Tavern have +2 Attack.
- Deathwing
- ALL Will Burn!:
- [Passive] ALL minions have +3 Attack. → [Passive] ALL minions have +2 Attack.
- Reno Jackson
- Gonna Be Rich!:
- [Cost 4] Make a friendly minion Golden. (Once per game.) → [Cost 3] Make a friendly minion Golden. (Once per game.)
Minions[]
- Savannah Highmane
- Old: Tavern Tier 5 → New: Tavern Tier 4.
- Herald of Flame
- Old: 4 Health → New: 6 Health.
- Golden Old: 8 Health → Golden New: 12 Health.
- Steward of Time
- Old: 2 Attack → New: 3 Attack.
- Golden Old: 4 Attack → Golden New: 6 Attack.
- Kalecgos, Arcane Aspect
- Old: 2 Attack / 8 Health → New: 4 Attack / 12 Health.
- Golden Old: 4 Attack / 16 Health → Golden New: 8 Attack / 24 Health.
- Nathrezim Overseer
- Old: 4 Health → New: 3 Health.
- Golden Old: 8 Health → New: 6 Health.
- Twilight Emissary
- Old: Tavern Tier 5, 6 Attack / 8 Health, Battlecry: Give a friendly Dragon +3/+3 → New: Tavern Tier 3, 4 Attack / 4 Health, Battlecry: Give a friendly Dragon +2/+2.
- Golden Old: 12 Attack / 16 Health, Battlecry: Give a friendly Dragon +6/+6 → Golden New: 8 Attack / 8 Health, Battlecry: Give a friendly Dragon +4/+4.
Other changes[]
- Transformation animations when playing a minion from hand will be sped up during the Recruit Phase, cutting down on the number of time players are left waiting for animations to resolve.
Undocumented[]
- Onyxia, Malygos, and Ysera received new summoning animations.
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