Yeah, his answer.
Ha no seriously though, expand your options from a Firepod and consider some "bigger and better" preamps. Technically, you can use the S/PDIF for maybeeee another two channels, but you'd have to get mic preamps with S/PDIF out and plug your mic right into that, which still only gives you ten inputs.
Two things to think about. Try sacrificing mics where you can (aka bottom mic only on a snare, single kick mic instead of two, only two overheads instead of two OH and a hat mic) and that way you'll be able to sacrifice some more channels. If you've got a board at your disposal, you're even better off. You could subgroup your snare mics - use the subgroup output instead of the DO's on each channel, etc, etc. If you are going straight in, just try to cut back mics where you can. Using my board, I just recorded a drumset with 4 toms, snare, kick, and a ton of cymbals WITH a rough guitar track - all in 8 tracks. It can be done
Second thing to think about - think about craigs-listing your Firepod and investing in a Motu, an 002/003, an RME....SOMETHING that isn't a Firepod. Firepods are very limited in their capabilities. That's why they're only $400. All of the above interface companies have brands with 8 inputs AND an ADAT input that you can lightpipe another ADAT preamp with 8 additional preamps into it as well as having a Word Clock in/out. Very nice for your time code. Your computer will thank you for it. Think about it, though.
Send me a personal message if you want help in figuring out how to mic the kit with a decent sound with only 8 ins. We'll see what we can do.