Villain is a reg running 21/16 with 8% 3bet and he flats button around 9% of the time. Not seen any real showdowns of note to tell how he constructs his ranges pre or post.

Not a hand I want to bet 3 streets with even button v Co and think this seems a reasonable hand to strengthen our check call range with.

Turn is quite a large sizing but think we should call again with Ax as he can decide to barrel again to fold out QQ-99 that check called flop as well as some 8x hands we play this way.

On river Im quite conflicted as to what to think both from an exploitable or optimal standpoint. Ax is one of the best hands that I check call twice with on this board aside from AA some portion of the time. However he does not have many bluffs except 67 and bd hearts that would have to be pure floats like QJhh or 910hh as I doubt he bets three times here with 8xhh. His sizing is also quite polarizing as while he only really flats stronger Ax hands like AQ-AT pre im not sure he triple barrels betting this big.

In spite of being near the top of our range is it ok to fold due to the lack of bluffs in his range and fact that he can play sets or 2pair like this 100% of the time and he may give up with bluffs as we look like we have an ace in this spot.