UB $100 hand - first level

[Nordberg]

Somewhat interesting hand from the UB $100 last night.

First level so we have like 4 million big blinds. Typical ub table I have leggggggggggggggggggggggggggggy to my left and doublelucky a few more to the left. Doublelucky raises UTG or UTG+1, MP calls (I do not know this player), I have 3s6s in the SB and I call, and legy re-raises to approx 160 from the BB. Doublelucky calls, MP call, I call.

Flop is As 2s 5s. I check, legy bets pot, doublelucky flat calls, MP gives it a thought and then raises all in. All of the players in the pot have me covered.

What should be my play?