A trading card collection is only ever worth as much as the game around it. Nifty Football had a finished collectible card set but no game. The cards were illustrated by Manchester artist Stanley Chow. Beautiful artwork with no reason to play. The brief was to build a full football management game on top of them, turning collectibles into players with statistics, unique traits, and a play loop worth coming back to.
The unspoken design problem: collectibles want scarcity, games want parity. Rare cards needed to feel valuable, but every card had to stay viable in a squad or the meta would collapse. Designed a stat system where rarity unlocked traits and ceilings rather than raw power, so every card was useful, but the rare ones were still worth chasing.