What do you think his range is here?

What does he do with a busted hearts draw?

what's the best bluff catcher here I wonder

Ad with a black card like 5c/Kc/Jc

Ad destroys pretty much 80% of his bluffs so i really doubt Ad is even in the bluff catchers
Ad5x is fine i guess though

80%? think thats a bit much, he can have hearts.

Sure he could have top pair with Ad and decide bluff jamming is better than trying to show down but esp at this limit not sure how often ppl are doing that. I think i'd rather block the majority of his valuerange.

i think Ad is more likely to be in 80% of his valuerange than 80% of his bluffs. although knowledge of villain's preflop strategy is actually very valuable here. If HU he is 3betting all his suited aces, K10dd, KJdd, KQdd, QJdd he actually has almost no value here in which case i would agree blocking Ad is actually a bad thing.

maybe AcQd is good. blocks all Qx flushes which he can have Q3/Q4/Q6/Q7/Q8/Q10 and maybe QJdd if he flats that pre. We don't have many Qx flushes with this flop and turn line except AQdd so blocking Qd isn't very valuable to him as far as bluffing goes.

he may not see it that way though. might call 2, decide he can't win and bluff river. while at the same time if he has Ad he might figure he has showdown and not bluff despite it being his best bluffing hand. In which case we don't want to block anything but smaller diamonds that aren't part of any of his bluffrange. Hard to say but after looking at it a little more i agree blocking Ad HU here isn't the best.