Quote Originally Posted by JimmyC27 View Post
Question 1:
For the mirror, I usually side out all my Force of Will plus some number of Swords to Plowshares. I generally bring in Dark Confidants, Vendilion Cliques, Sword of Feast and Famine, and Surgical Extractions. You don't necessarily need all 4 Jaces in the mirror because there are a lot of ways to keep your opponent's Jace off the board (Countermagic, Lingering Souls, EOT Flash creatures, etc.). Having that 4th Jace makes the deck a little clunkier--especially when it could be something else, like a Thoughtseize, that'd nab important cards from their hand or set up a clear path to play your own Jace.
I would add Jace Beleren ("Little Jace") before a 4th Jace. You can get him down a turn earlier, UW control often is not applying direct pressure, meaning they can't cast Big Jace before dealing with Little Jace, giving you more time to find your Big Jace (e.g. draw down Little Jace and keep him at 1 until you get a Big Jace, zero him out and then cast the big guy).

You can't be as proactive like this against BUG because they have Abrupt Decay and creatures to pressure your Beleren. It's probably more useful as JTMS removal in that matchup.

But more discard is also a decent option in this situation, and is relevant against combo as well.