Well, I think many of these cards deserve mention, but for me, it has always been Leeroy. It was nerfed once already and right now is a staple in every aggro deck even after the nerf. It's burst damage for classes that don't normally have it or are conditional.
For flavor purposes, it may never get HOF'd at this point, but I still hate the card more than most on this list.
Any of the combo pieces that composes those abominations that were Freeze Mage and Exodia Mage.
Custom cards :
CLASSES : Alchemist (CCC#5 | Phase V) | Chef (CCC#4)
EXPANSIONS : Year of the Scorpion (Year Comp)
Why no Barnes or Voidcaller?
e: or Kingsbane?
Or Coldlight Oracle ...
Mysterious challenger
Well, I think many of these cards deserve mention, but for me, it has always been Leeroy. It was nerfed once already and right now is a staple in every aggro deck even after the nerf. It's burst damage for classes that don't normally have it or are conditional.
For flavor purposes, it may never get HOF'd at this point, but I still hate the card more than most on this list.
Omega Devastator/Omega assembly
I would add Death Knights (Mage, Warlock, Hunter) to the list
--Alfi--
Where is Mr. Barnes
Prince K deserves to be in this 4 sure
Where the hell is auctioneer???
You forgot Yogg-Saron, Hope's End, which was nerfed based entirely on player hate rather than actual data.
"Why, you never expected justice from a company, did you? They have neither a soul to lose nor a body to kick." -- Lady Saba Holland
After all these years I'm still very salty about oppos killing me with Leeroy for exact lethal dmg with me having lethal set up on board lol