Blue can draw the most, sure, but it also has many, many redundant effects and cheap options on the curve that can do other things
Some exclusive cards like Hop's Snorlax are only available through specific means, varying in value
Your opponents will likely forget about the card as it sits in your graveyard, giving you room to spring a blowout when they swing in
Furthermore, the condition of the card heavily influences its rarity and value
Quistis Trepe Qusitis is a great card for those who think Final Fantasy 8 is a subpar game in comparison to its storied predecessors, as Qusitis is basically Snapcaster Mage but worse
Then shuffle your library.) Razaketh, the Foulblooded: It ain't no Griselbrand (4BBBB Legendary Creature Demon Flying, lifelink Pay 7 life: Draw seven cards.) 7 cards will cost you 14 life and 7 other creatures with this dude