Now, while money is an object to consider, Jace Beleren is a fine addition to the deck, even though, while not netting you a card for your own self every turn, the other Jace fits the milling theme well, but as I have just realized, the other Jace should be used more as an only card in a deck that is designed to offer milling as an alternate win condition and not its main (or in this case, only) one
This beautiful shapeshifter can synergize with any tribe as its abilities not only make paying for creatures of your specified types cheaper, it also gives them an anthem, too
Blink a Dockside Extortionist every turn for lots of mana, a Gray Merchant of Asphodel to deal extensive damage, or a Mulldrifter for plenty of card draw
This iconic 8-cost Amethyst powerhouse can exert opposing characters and completely freeze them down, preventing them from readying on their next turn