Marvel: Power Siphoning

Siphoning is the distinct ability of siphoners are to absorb or consume magic from magical objects and other supernatural beings albeit temporarily. Life Force Absorption (Siphoning) : Siphon has the ability, and need, to drain the life force of other super-human beings with regenerative powers to sustain his own.

Gabriel Summers (Vulcan)
Vulcan demonstrated the ability to siphon his opponents' powers. This was shown in the X-Men: Deadly Genesis series when Vulcan siphoned Marvel Girl's power of displaying events of the past through telepathic means. It is not known whether he permanently kept these powers or not, but it's unlikely.