Template:The Four Horsemen strategy
General tips
- Since Rivendare has no minions in his deck, any Joust minion played by the player will be guaranteed to win their Joust. This can make them strong choices or alternatives for the fight. Note that the Joust mechanic was not introduced until The Grand Tournament, more than a year after the release of Curse of Naxxramas.
Priest
One strong class for Heroic mode is priest. Note that after defeating The Four Horsemen in normal mode, you want to run 
Deathlord for heroic mode, because Baron Rivendare has no minions in his deck, making Deathlord a very effective minion with no drawback.
Include the maximum number of these cards in your deck: Silence, 
Holy Smite, Inner Fire, Divine Spirit, Crazed Alchemist, Shadow Word: Pain, Mind Blast, Ironbeak Owl, Acidic Swamp Ooze, Deathlord, Mass Dispel, Shadow Madness, Loatheb, Cabal Shadow Priest, Holy Fire
At the beginning of the game try to mulligan for Shadow Word: Pain, Silence and Deathlord (in Heroic). The Baron will probably play a secret on his turn 1 - either Avenge, Redemption or Repentance. On turn 2 you should aim to Shadow Word: Pain one of the Horsemen. If the Baron's secret turns out to be Avenge you can Silence the buffed horseman to eliminate the stat boost and the immunity at the same time. In the case of Redemption you can let him live until you are able to effectively finish him off (by using Wild Pyromancer or Holy Smite). If it's neither of them, then don't play Deathlord on turn 3 because his health will be reduced to 1. The optimal play is playing Ironbeak Owl to silence another horseman, as this will waste his secret and the Owl only has 1 health anyway. Another good turn 3 play is Crazed Alchemist to change a 2/7 to a 7/2, followed by Holy Smite. The alchemist will only lose 1 health, effectively also wasting his secret.
However, even though you have ample ways to destroy the horsemen, try not to kill all 3. This will give the Runeblade +6 attack, which is much worse than just keeping a 2 Attack horseman on the field. To win then, you have two options. The first is to silence the last horseman and finish the Baron with Mind Blast and Holy Fire. The second is to steal the last horseman using Shadow Madness or Cabal Shadow Priest, making sure it has full health when you do so. Then, use Divine Spirit to double his Health to 14, followed by Inner Fire or Crazed Alchemist change his Attack to 14, and use him to defeat the Baron.
To buy time to draw your winning combos, play Acidic Swamp Ooze to destroy the Runeblade, forcing him to waste mana to re-equip, as well as healing yourself. The ultimate stall card is Loatheb. Since Baron Rivendare only plays spells, it will be extremely hard for him to play any cards next turn to remove him. Thus, Loatheb not only wastes a turn for your opponent, but is also almost a guaranteed 5 damage, which is huge against a boss with only 14 health.
Add a Faceless Manipulator on a horseman to cheat the system. Makes your hero immune and stops Baron Rivendare from doing anything. Use Divine Spirit and Inner Fire on the horseman to further increase your odds of winning.
The Whispers of the Old Gods expansion introduced 
Shadow Word: Horror which can trivialize the fight by removing all 3 horsemen in one go.
Druid
Another good option for Heroic Horsemen is the druid. The class is compelling due to Naturalize, which eliminates a Horseman before either Redemption or Avenge are played. It's worth restarting the fight until you have it in your starting hand.
Include the maximum number of these cards in your deck: Naturalize, Bloodsail Corsair, Acidic Swamp Ooze, Faerie Dragon, Loot Hoarder, Healing Touch, Poison Seeds, Swipe, Keeper of the Grove, Nourish, Spectral Knight, and Stampeding Kodo.
The key to this strategy is to encourage the Baron to play his cards. Both Bloodsail Corsair and Acidic Swamp Ooze will punish him severely for an early Runeblade, as well as giving him targets for Soulfire, Frostbolt, and Shadow Word: Pain. Loot Hoarders are also removal-bait that keep your hand full of options.
In the mid-game, carefully weigh out the perfect moment to play Poison Seeds. If Redemption is in play, Swipe will likely be your follow-up. If Avenge triggers, have Keeper of the Grove ready. Though you may be tempted to include Starfall, keep in mind that it is a dead card once the minions are dead. Bloodmage Thalnos is a better Swipe complement for this fight, if you own one. Use Healing Touch as early as Turn 3, to survive to this point.
Your end game will revolve around the un-targetability of the Faerie Dragon and Spectral Knight. With no minions opposing them, their greatest fear is Consecration or a Runeblade. Crazed Alchemist really shines as support here, assuming you've not already comboed yours with Bluegill Warrior or Wrath.
One last consideration is to leverage the 'mill deck' angle. Naturalize will help to fill the Baron's hand, especially if he is using his hero power. With all minions dead, a mittful of targeted cards, and a comfortable life total opposing him, the Baron will rage uselessly as Runeblade after Runeblade goes up in flame.
Decklists
- Hearthpwn.com - The Military Quarter Heroic Boss Deck Guides
- Hearthhead.com - Decks for defeating Heroic The Four Horsemen
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