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They were trying to find a way to get more spells into the set and came up with the idea of spells stapled to a creature that you could cast later

It was represented by a giant card

Remember, this determines a lot about what the final creature is including power and toughness, the name, and the creature type

Even odder than that, Wizards didn't reveal card text or even rarity of the cards

You can copy something at instant speed, and I doubt someone is going to Strip Mine or Demolition Field your Mycosynth Gardens for something you may have later

THE MULTIVERSE and PLANESWALKERS Before I start breaking down the whole of Magic lore there are some key aspects of it that are essential to understanding the story