Drawing for low

[C Dubya]

Online 2-4
Ac2cTsQh in the big blind.

2 callers to MP, who raises. The raise most likely means A2 but I've seen this player raise with good high hands and good 2 way hands. 6 of us play for 2 bets each.

Flop 7s6s6h
No high for me. I'm playing for 1/2 or 1/4 of the pot. EP bets, same MP raises. 4 call, including me. 10 big bets. Should I have considered letting this hand go?

Turn Jc[7s6s6h]
Checked to MP,who bets. CO raises. All call. Is my call correct? If I've calculated correctly, pot odds are 2.75:1 and I'm drawing at 1.75:1. BUT there is the possibility (probability) that I'm drawing to be quartered.

River: Js[Jc7s6s6h]. MP wins with spade flush after river checked around. He did have A2 of course.