Starting a new list but now with wipe count
Currently only with WoD and Legion but we'll update it to include declared wipe counts from MoP and Cata, at least.
#1 Kil'Jaeden, Tomb of Sargeras - 654 (Method)
!!innacurate!! Ragnaros, Firelands - 500+ (Paragon) ; in their site they say 500+ wipes they lost count at some point
#2 Archimonde, Hellfire Citadel - 472 (Method)
#3 Fallen Avatar, Tomb of Sargeras - 453 (Method)
#4 Blackhand, Blackrock Foundry - 325 (Method)
!!innacurate!! Lei Shen, Throne of Thunder - 310 (Method) ; i need a better source on this one
#5 Garrosh, Siege of Orgrimmar -272 (Method)
#6 Gul'Dan, Nighthold - 248 (Exorsus)
#7 Siegecrafter, Siege of Orgrimmar - 229 (Method)
#8 Elisande, Nighthold -229 (Serenity)
#9 Paragons, Siege of Orgrimmar - 222 (Method)
#10 Xhul'Horac, Hellfire Citadel - 180 (Method)
To do: retrieve as much as possible from MoP and Cata. We're lacking ToT official count, aswell as tier 14. We're lacking Cata's tier 11; aswell as tier 13 (which was a mess).
Before Cata that wipe count wasn't a thing.
Notable: Paragon's Garrosh10 had above 600 wipes.
Interesting references:
-Yogg0 World Second (Paragon) - ~160 ; we don't know how many tries the world first (Stars) did. Note: boss was nerfed during their progress period, Stars killed it a day before nerf.
-LichKing25H (Paragon) - 170+; limited attempts, only guild to beat the fight on 5%
Cataclysm
Mists of Pandaria
Warlords of Draenor
Legion