Karn from Duels of the Planeswalkers 2012 was this for me.
He's supposed to play a pretty crushing artifact deck, it Tinkers and Show & Tells into Darksteel Colossus or Sundering Titan, uses a few banned Modern format cards (despite the cheaty cards this is primarily a Modern deck, it doesn't play in Legacy) but he doesn't capitalise on his deck fast enough. For one thing this is a pretty bad deck and secondly he doesn't ramp fast enough. With a proper list he should have the Colossus out turn 1 every time. All in all I'd struggle to play this deck at FNM, he doesn't play it properly but this deck is fundamentally misconstructed.
He's the final boss of the main campaign. I've found countless walkthroughs asking how to beat him and known half a dozen odd people that had trouble beating him. It baffles me because ina kind of Driver way the first match against Koth was in my opinion one of the hardest int he entire campaign.
He's supposed to play a pretty crushing artifact deck, it Tinkers and Show & Tells into Darksteel Colossus or Sundering Titan, uses a few banned Modern format cards (despite the cheaty cards this is primarily a Modern deck, it doesn't play in Legacy) but he doesn't capitalise on his deck fast enough. For one thing this is a pretty bad deck and secondly he doesn't ramp fast enough. With a proper list he should have the Colossus out turn 1 every time. All in all I'd struggle to play this deck at FNM, he doesn't play it properly but this deck is fundamentally misconstructed.
He's the final boss of the main campaign. I've found countless walkthroughs asking how to beat him and known half a dozen odd people that had trouble beating him. It baffles me because ina kind of Driver way the first match against Koth was in my opinion one of the hardest int he entire campaign.