Perilous Vault is only good when you don't have walkers in play. Which should never happen. Vault is better in a control build that doesnt relay on permanents to win.
Dissolve also gets kinda awkward when you want to be casting walkers/creatures every turn. If you try to leave mana open to counter a spell, you fail to develop board state. If your running Jace, maybe look into a delve card like
Empty the Pits to use the cards he puts there to good use. I'm honestly not a fan of the Hydra. On turn 9 do you really want to be casting him for X=7 to maybe get one other thing or play a planeswalker with
thoughtseize/downfall/charm back up? As for the land base, the 4
Mana Confluence and pain lands will probably hurt you more than help you. I would maybe try the palace (uncommon land from KrK that will give you G,U,B colors. Enters play tapped.) I would play those over the pains/ some number of the confluences. Courser will help a little but not much if you run that many lands that hurt you. Also, since the tomb is Legendary you really don't want 3. You'll see it enough with 1-2 copies.
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