If you're really lucky, you could pull the full artwork Two-Star Misty if you manage to get a Rare pack, which is also known as a "god pack" in meta parlance
[31] The morning after the boat ride, Ishizu led Yugi and his friends to the Shrine of the Underworld and instructed Atem to place the Millennium Items into the stone tablet
You might think to take advantage of Thurids Shadowfax machine to abuse whites token-foublers, but remember that copied spells merely resolve into tokens and arent considered created for the purpose of something like Mondrak, Glory Dominus
As a current Magic player, I know exactly where youre going with the cards, although I could offer some nitpicking rules language corrections
You'll still want to complete other collections (if you haven't yet), but with so many interesting cards to get on Mythical Island, I wouldn't sleep on the Mew packs for now.