You can buy HP copies for around $35, while upgrading to an LP card will cost about $90, while minty fresh copies can command north of $125
Honestly, I don't think so
Count the number of Forests you control as Mirkwood Channeler's ability resolves to determine the value of X
Despite this, the value of Reshiram from Legendary Treasures is fairly steady at $232, with little movement recently beyond a random spike up to $248
Don't forget to take what you've learned out to your local game store for Phyrexia: All Will Be One events, too, to get that analog experience of opening packs, finding amazing cards, and having fun tapping and casting across from someone who could be your next friend.
Meanwhile, Mew ex from the EX Legend Maker set was one of the first cards to be featured in a winning World Championships deck two years in a row (2006 and 2007)