The story here is that you are accepting hunting missions, fighting and slaying increasingly epic monsters (known as Marks), until you are ready to battle the biggest and baddest monster of all: Yiazmat
Alternatively, you can play a political game by donating harmless or symmetrical cards like a used-up Pentad Prism or a Howling Mine
With a bigger focus on having lands on the battlefield in new Standard, I foresee Nissa, Vastwood Seer to be easier to flip than ever
Mari, the Killing Quill is easy to cast, and with deathtouch, your opponents will be less likely to block your Assassins out of fear of losing their own important creatures
Vivi Ornitier and Proft's Eidetic Memory were found in a huge percentage of competitive Standard decks, and Wizards chose to ban them to promote diverse deckbuilding
Seriously, I have touched several times on how important and revolutionary the modal lands mechanic is for a card game rapidly approaching its 30th year