Arlin first featured in Shadows Over Innistrad and then in War of the Spark, both cards support the Werewolf theme well
Both very playable and good at what you want them for but not a complete cover all so as to make life easy but dull
As milling has a mental attack flavor, it is very natural in blue
Toph, the First Metalbender, a Red/White/Green Human Warrior Ally, earthbends for 2 at the beginning of your end step and also turns all nontoken artifacts you control into lands (though they dont tap for mana) to give you more earthbending targets
It's also responsible for another recent price spike, pushing up the price of Gix, Yawgmoth Praetor along with Preacher
He immediately makes up for that by returning 2 cards from the inkwell to the player's hand, however, and can keep generating value as a great card for questing