mtg 2015 core set booster box Magic The Gathering (MTG / M15 Intro Pack / Theme Deck Nicol Bolas Magic 2015 Core Set (m15):

Beast - Tragic Hero will net you an extra card every turn if left unchecked , while Clarabelle, Light On Her Hooves ensures you and your opponent always have the same number of cards in hand, with these two cards, as well as a number of cards that replace themselves like Clarabelle, Contented Wallflower and Let the Storm Rage On, this deck no longer struggles to keep cards in hand

That's not part of the mechanic itself, just something flavorfully tied to permanents it appears on

That customization means every game plays out a little differently and makes Magic the deepest strategy card game there is

All were established decks prior to the release of Magic: The Gathering FINAL FANTASY, but the sheer popularity of Izzet Prowess and Azorius Omniscience has exceeded even the expectations of Pro Tour veterans and coverage insiders