The method of use is to destroy a low-level CM (Cookmate) monster, then Special Summon a higher-ranking card group, RCM (Royal Cookmate), using Continuous Trap Food Cemetery and Continuous Magic Wonder Recipe, increase attack power during your turn to battle, and battle the opponent's turn
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Monster Tokens may be used as Tribute or material for Special Summoning methods (except Xyz Summon, as Xyz Materials are not treated as being on the field), but cannot be used to pay any cost that involve a monster moving to a specific location (they can be banished, as the banishment is not considered a location, but will still disappear permanently since they are leaving the field)
Feed the Serpent is good removal
Considering that these are just decorated pieces of cardboard, thats quite a lot of value for something not in mint condition