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For the player casting the ante spell, the card should allow the player to do something they want that may not be feasible without ante because of its high power level

A card's mana value doesnt change if you cast it with alternative or additional costs

If the binder is mostly staying inside, or not holding very valuable cards, you probably wont have much need for a zipper, but if the binder will be frequently bouncing around a backpack, or holds more valuable pieces of your collection, a zipper may be in order.

Perhaps you flicker something like Quantum Riddler or Novice Inspector for value, or you kill an opposing token, or just remove a blocker so you can attack for lethal