The only thing keeping this card down is the lack of selection, but if more Onix or Golem cards are added in the future with worthwhile attacks, it could see better days in the future
I should be able to find someone to swing her at when she first joins the fray
You want to enter your main phase with 7+ cards more often than not
Mill decks will definitely be including this Jace Variant, as its ultimate ability is too tempting and hilariously mean to resist, and counter manipulation via Proliferate makes it that much easier to activate
Foreboding Ruins
If they lack a powerful card to act as a centerpiece, starting with one of the games core mana types, forest, plains, swamp, island, and mountain, is the way to go