It does cost four mana and only clocks in at a 2/2, but it's still a worthy inclusion for that additional land drop
With the release of top notch delve cards from Tarkir, the delirium mechanic things, flashback stuff, recursive dorks, and even just an increase in good graveyard recursion effects there is a significant increase to the value of self mill
They fit standard-sized cards perfectly and are praised for their clarity and shuffle feel
Even more, I do happened to have a healthy number of planeswalkers in the deck, so cheating into play isn't too hard
Each card is double faced, with the ability to transform convert the character from one form to its alt mode
It fits naturally in legend-heavy builds and sees play in Murktide, control, and combo decks that value instant-speed answers without sacrificing land slots