In wu Solemnity deck work very ...very..well.
For my experience Ub Omnitel work Better.
yes you are right
i play rector / omniscience and show and tell is absolutely essential.
win more games thanks to show that thanks to the rector.
right now I'm playing a UB version without rectors.
deck is really cool and funny to play but omniscience/emrakul is better that any planeswalker exist in this moment.
dredge basic trick: put ichorid ability in stack and active bazaar for dredge, dredge cards --discard ..and pay ichorid cost.
for great deck need effect like gaea's blessing for exile cards and go in loop with c.chill
mirror fate.... but not work well