Ok, so I am offering this merely as a suggestion, but I am officially stating that I am NOT a fan of this idea.
Take the hilarious example from above:
You build said team, nothing happens, you play a game with the team, nothing happens, you win the match and you receive the EASTER EGG reward icon.
You go to your Troop Menu and there is a new Tab labeled EASTER EGGS, all of them are locked except for Bone Thugs n’Harmony which you can click on and see the bonus. It unlocks a passive bonus that has a 50% chance to cause an undead troop to become ENCHANTED. This bonus is “purchasable” for 50 gems and the bonus lasts for 24 hours.
It applies to ANY team that contains ANY undead. But in order to get the ability to unlock you have to stumble upon the team AND win with it.
Ok… maybe I don’t hate the idea…