Eowyn's MTG debut is a very welcome one indeed, you'll be seeing her at more than a few tables
While some of these rights apply generally, certain rights apply only in certain limited cases
Carrion Feeder can get huge quickly, taking out opponents with your burn effects, while Seer scrys to give you plenty of control over what youre drawing
You can have more, but I recommend sticking as close to 40 cards as possible while aiming for a ratio of 24 playable cards to 16 lands, adjusting for your curve as you see fit
However, its impossible to know which version of Ancient Mew you received without examining the card itself inside the pamphlet
It has more of a comic book style with the impact of the hammer being portrayed with blue stars and a swishing splash of colorful effects