Sometimes one of the commons will be replaced with a foil card of any given rarity, usually common but they can be of a higher rarity if you're lucky
While you might be throwing out an All Is Dust or Austere Command from it once in a while, you're more likely to be playing smaller cards like an un-overloaded Vandalblast
It's most often associated with red and black creatures, making them much more difficult for opponents to block, especially in large numbers
Also, Wild Idea is definitely finding Dramatic Reversal for the inevitable Isochron Scepter infinite mana combo
After much consideration, here is my list (which, unfortunately, I know I should have included Tainted Pact on, but I did not, sorry)
Reverse Holo Cards As usual, the Japanese set will feature reverse holo cards with glittery Poke Balls over the card