Buy 2, get 10% off.
Buy 3 get 20% off.
Buy 4 or more and get 30% off
It doesn't have to be multiples of the same card. Any 2 will get 10%, any 3 will get 20%, and any 4 will get 35%. Just add them to your cart, and the discount will be applied.
Be sure to add all the cards to your cart before purchasing to receive the discount!