[registrar]

I would be very, very surprised if either of the flat callers folded to my all in so you're asking whether I'm happy to take a chance in a four way pot to quadruple my chips with 87s?
We need to know when the rebuy period finishes, what the starting chips are, the add-on situation but, if I was tempted by this pot I can't see the benefit of the all in. You can close the action with a call and see the flop and you're very unlikely, particularly in a rebuy, to push the two flat callers off the pot. The normal line here is that you're pot committed by calling so why not stick it all in but if the flop has two face cards, no flush draw or str8 draw and no pair for you and you check with the others going all in I would fold.
Having said that, I personally wouldn't call (for essentially all my chips) in this situation with a reasonably healthy stack at what must be near the end of the rebut period especially with position for the next few hands. Seems elementary to me but maybe I'm missing something. The site I play rebuys on and the level at which I do is so full of fish and particularly of gamblers who can't change gears after the break that there seems little point in risking solid cash to achieve a large stack before the break. Before the break, the stack can be made from tangling with good players you know are going all in with any two cards and after by taking the time to pick your spot.
I think this might be different on stars or party poker with a larger field of better players.