basically, control and mill. i will explain each cards importance and combos i frequently use.
Jace, Memory Adept: duh
Spirit Mantle/Swiftfoot Boots: i use spirit mantle to help protect my creatures and jace. being immune to creatures, they can block all day and not die. i swap in swiftfoot boots against heavy burn decks.
Pacifism: controlling creatures
Trepanation Blade: it was a tough choice between this and Sword of Body and Mind. i'm still trying to decide, as the wolves generated from BM provide blockers for jace, but trepanation blade provides +x/+0 and mills even when it does not do direct combat damage.
Mana Leak: more control.
Blue Sun's Zenith: mainly for draw power/ making them mill when erasures are out.
Undead Alchemist: he almost didn't make the cut, but there is so much discard with him, and when the zombie tokens aren't chump bocking for jace or myself, they are helping mill.
Oblivion Ring: control
Day of Judgment: only to be used in extreme cases, or if you have creatures ready to play down.
Ponder: early game draw
SIDEBOARD so far:
Swiftfoot Boots: swap in place of spirit mantle when facing heavy burn decks.
help me out with it guys! +1, comment, playtest, anything to help me! leave links to your stuff and i'll return the favor.
if you want you can throw in a couple phantasmal images to copy things like your jaces archivist for shinanigans. or just as another blocker for some flyer or something
if we are talking about the best use of phantasmal image it is definitely that it destroys flying gesist decks...you play it as a copy of Geist of Saint Traft and they go boom i have a flying geist deck and that and Phyrexian Metamorph are my biggest fears hahah
maybe sideboard Laboratory Maniac in case they are playing self mill you can switch over