also go for demonic tutor, less mana cost. lichs tomb, platinum angel, and eternity vessel are the only cards i would at and only to the side bar.
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hmm. u need back up cards, cards that will allow you to "lose" but continue. with this many mobs it would be good to have some artifacts that give u lifelink or deathtoutch. good base but protection decks will run right through you even with the discard effects.
liliana was an accident. unstable frontier should fix the problem with obelisk of alara, along with khalni gem which was already in there, also explorers scope is played more like a blue draw card than anything. lichs mirror and eternity vessel are fail safe cards used only as a plan b.