New world order In one of his articles, Mark Rosewater introduced us to the New World Order in their design process: They would make sure that the common cards as they are the cards that new players will have the most contact with will never be overly complex: They should be easy to understand and easy to play with, so as these players become more interested and start buying more packs, they will gradually start having contact with rarer, and more complex cards, making the learning curve less steep
Not so long ago green was really short of good three drops and played all sorts of off theme junk to fill out the curve
Why beginners love it: Teaches sequencing
If you do, until Vesuvan Shapeshifter is turned face down, it becomes a copy of that creature, except it has At the beginning of your upkeep, you may turn this creature face down. Vesuvan Shapeshifter normally costs five mana, but you can cast it as a morph card for three, and then it only costs two mana to flip