Although cards like quests and even sagas that tell a story exist, WotC nailed these designs, representing common JRPG and gaming tropes on MTG cards
Having ways to recover those cards you discard or permanents you sacrifice greatly reduces the cost you pay to draw cards
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Winda, Priestess of Gusto X WIND Level 2 [ Psychic / Effect ] ATK 1000 DEF 400 When this card is destroyed by battle with an opponent's attacking monster and sent to your Graveyard: You can Special Summon 1 "Gusto" Tuner monster from your Deck
You can get crazier with cards like K'rrik, Son of Yawgmoth or Necropotence, which allows you to dump your life total and cast cards for cheap, or you can play it safe with cards like Read the Bones or Bitter Triumph
Zara, Renegade Recruiter lets you steal creatures right from your opponents' hands, which gives you a chance to swipe powerful ETB triggers off creatures like Etali, Primal Conqueror that other threaten effects miss