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I managed to craft the Team Fortress 2 badge after trading away a couple of duplicates to friends. However when I went to view my badge progress, I noticed that the remaining duplicate cards had formed an alliance and were requesting more of their friends for another badge.

Just how many levels are there for card badges?

marked as duplicate by Raven Dreamer Nov 12 '13 at 2:10

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    Duplicate: gaming.stackexchange.com/questions/118118/… – user57112 Nov 12 '13 at 2:10
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    thanks @John, that didn't come up when I searched, nor as a suggestion when writing the question – Robotnik Nov 12 '13 at 2:11
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    Really? That's odd. It showed up as the first related question for me. (Maybe those lists don't populate until the question gets posted) – Raven Dreamer Nov 12 '13 at 2:13
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    @RavenDreamer - in any case, next time i'll search harder :) – Robotnik Nov 12 '13 at 2:14