Almost every English EX-era expansion through early 2007 included two or three Gold Stars as its final cards: the legendary beasts in Unseen Forces , the weather trio and Metagross in Delta Species , the Regis in Legend Maker , Pikachu and Mewtwo in Holon Phantoms , Alakazam and Celebi in Crystal Guardians , Charizard and Mew in Dragon Frontiers , and the original Eeveelution trio in Power Keepers
Five mana is a little slow, but I think this could really play well in an Academy Rector role an easy-to-cheat-in stepping stone which opens new routes to payoffs like Bolass Citadel
These aren't the same as double-faced cards, however, as both sides are functionally exactly the same, possessing the same text and abilities
Almost every booster pack contains about 1-2 of these
Add spellslinger strategy support
If you do, you may play that card without paying its mana cost