This category covers all non‑autograph insert cards from Upper Deck Synergy across every release year. Synergy inserts are known for their foil layering, acetate construction, metal cards, serial numbering, and multi‑tiered designs that collectors actively search for. This includes Cast for Greatness metal cards, the full Exceptional series (Stars, Rookies, Phenoms), Synergistic Duos, Postseason Brilliance, Rookie Journey, and Constant Threats. All color parallels are included, such as Red, Purple, Green, Blue, Gold, and Black 1/1, along with acetate variations found throughout the insert lineup. These inserts feature veterans, rookies, legends, playoff performers, and multi‑player combinations, offering collectors a wide range of visually distinct and short‑print cards.
