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
Questing with Tamatoa not only gets you two lore, but allows you to play an item from your hand for free
Each card has a level 1 to 12, with level 1 to 4 cards being the ones you can put down whenever you wish
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