Unlike some of the Normal decks in the meta, Mew ex requires time to get its pieces into play
So, taking design notes from a few Hydra creatures, he created a card that would lose heads and be made vulnerable for a time, before regrowing even more of them soon thereafter
You can only search for towns out of your library with cards that specifically tutor up non-basic lands
If you jump through too many hoops and spend too much time and mana putting a creature that gets answered onto the battlefield, then its pretty obvious that you would have been better off just casting spells that impact the battlefield from your hand
After all, its about half reprints and half new cards, and its intended to be a beginner product that establishes a base set for the Standard format
Ever wondered why a single piece of cardboard can sell for more than a luxury home