Originally posted by StylishSmurph
Mystique's easily the highest on that list...She can phase, go invisible (well, extremely good camouflage), grow weapons from her limbs, and pose as any proper personnel.
Domino should be near the top. With her abilities, she can crack any lock or computer-coded device, and possesses more stealth gear than most on that list. Plus, she'll know where to go more likely than not, and could possibly cause security equipment to malfunction.
Nightcrawler can teleport...
I wouldn't put Wolverine at the top.
Because any of the old Uncanny X-Men are invisible to computers thanks to Roma.