Player cards are colored based on how rare (or good) the players are.
It is based on the DNA you put into the players.
The rarity of a player is shown in the right side of the player card.
The 7 rarities are:
- Common (grey card - worst)
- Uncommon (green card)
- Rare (bronze card)
- Super rare (silver card)
- Epic (gold card)
- Legendary (special red card)
- Mythical (special purple card - best)