Cereal Alters (@cerealalters) Facebook Actual secret lairs called "just add milk", because they are cereal box designs on cards. 3 cards for $29.99 1000 guesses on card designs, and I still never would've hit this. Unnecessary, Roommate found a frugal way to hold her cards using a cereal box. : r magicTCG Actual secret lairs called "just add milk", because they are cereal box designs on cards. 3 cards for $29.99 1000 guesses on card designs, and I still never would've hit this. Unnecessary,