[s1e17] Ruler Instant

(Season 2, Episode 3), which prominently features a paper clip.

If you are looking for an episode where paper is a central tool, you might be thinking of: [S1E17] Ruler

(Season 1, Episode 9), where MacGyver uses paper towel rolls and a corkscrew to defend against an assassin. (Season 2, Episode 3), which prominently features a