The wasted rare slot prizes go to Ogre Battledriver, Oracle of Bones, Fated Conflagration, Harness by Force, and Steam Augury
STRONG BACK Speaking of carrying games, lets look at Strong Back from PIP
I can see this card being really good in decks like Affinity or Amulet, which often use colorless mana but also need specific colors to cast their core cards (like Emry or Arboreal Grazer )

Aurora, Regal Princess x3 Aurora, Briar Rose x3 Aurora, Dreaming Guardian x1 Flounder, Voice of Reason x2 Gramma Tala, Storyteller x2 Jasmine, Disguised x2 Maleficent, Sinister Visitor x3 Maleficent, Uninvited x1 Mickey Mouse, Detective x3 Mufasa, King of the Pride Lands x2 Scar, Mastermind x1 Develop Your Brain x3 One Jump Ahead x2 Coconut Basket x3 Magic Golden Flower x2 Beast, Hardheaded x2 Captain Hook, Forceful Duelist x3 Goons, Maleficent's Underlings x2 Hercules, True Hero x2 Kristoff, Official Ice Master x2 Maui, Demigod x1 Prince Eric, Dashing and Brave x2 Simba, Rightful Heir x2 Simba, Returned King x1 Fire the Cannons x2 Grab Your Sword x1 Ransack x2 Smash x2 Frying Pan x2 Amber and Amethyst Deck Amber cards are all about support, offering buffs and enhancements to other cards, while still offering plenty of choices for the player
New high quality proxies have the same thickness but they retain a distinctive, different feeling (similar to Poker cards)