This is the definition of flyer. Taschner is 31 year old lefty with no history of success with the Giants or the Phillies.

Here is b-r page:

http://www.baseball-reference.com/players/t/taschja01.shtml

It goes to show that if you throw left-handed, there is always a chance, always a tomorrow.  Taschner can strike a few batters out, but lefties have done well against him and he walks way too many guys.  Another arm in camp for a look.

UPDATE by Charlie: Like dtoddwin says, Tascher isn't very good. Lefties have a .774 OPS against him for his career, so he really can't even be used as a LOOGY. But as a lefty with plenty of major league experience, he'll be vaguely useful to have in the minors. This is apparently a minor league deal, so there's no risk involved.