Currently playing this deck in Masters and it seems to be doing well in most matchups. For a strong early start you ideally want one of your ambush units and Veena's Masterpiece in your hand. You play the ambush unit at the end of the opponent's turn so they don't have the opportunity to remove it, then play the relic the next turn and buff for an immediate attack and card draw. I include Midnight Reprieve in the deck because it helps build up Master Archivist and also provides some additional card draw. If I get a Secluded Rift in my opening hand I will play that as my first power, also to help boost Archivist. Either way, Archivist doesn't really grow huge with this deck and is mainly included as insurance against power screw. If you want to replace it with another card that helps ramp power I think that could be a fair substitution.