Well, a Planechase card, or oversized MTG, card is essentially two cards laying sideways, put together
Not only do you get to counter your opponent's threat, but you also deal damage to their face
While you may have been brainwashed to see an Aura and think bad because card disadvantage, now is the time to free yourself from said brainwashing
But if your opponent plays a creature at instant speed that's bigger than the attacking one, it becomes a 2-for-1 since not only will you lose your creature, but you'll need to spend resources to remove the new threat
I might flip through more binders and take a quick peek at the bulk for the sake of the seller, but once I know I'm buying the collection, the counting stops