BIG DRAWS missing! call river?? 1/2 PLO8 on stars

[GaZaZaZa]

playing moderatly laggy as i normally do, villian is a good solid player, however i have made two bluffs on him in $100 pots and showed, so its very possible he is aggitated.

my stack is $438, he has about $300 blinds are $1/$2 and its 6max

my hand is Ac 2c 5d kh

i raise pot to $7 utg villian calls and BB calls, making the pot $22

flop comes 3c jc 4d i bet $18(that being my lucky number and all) villian calls, BB folds.

Turn comes King, giving me top pair with my low wrap and NFD, i bet $50, villian takes his time, pressing the time button.... and calls.

river brings a repeat 4... i check, villian INSTANTLY bets pot???

i put him on a decent low draw, maybe with the jack and this bet just screams BLUFF BLUFF BLUFF to me as he could have raised a set earlier and i honestly believe that he would check behind anything worse then trips, which given the range of hands he could have, even though i dont know the maths seems unlikly..right...so i called


comments on all streets appreciated, especially on the river call.