The deck is very consistent and gives itself natural protection thanks to all the shield counters it can spread around
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While Vivien is worse than Birthing Pod in the best Birthing Pod decks with regard to mana efficiency, Vivien is a better card on average
We have a bunch of viable 3-mana artifacts that can ramp into Ugin (and then trigger his static ability to exile an opponent's card once he's in play) but don't forget about Hedron Archive as a low cost way to jump from 4 to 6 mana (7 with your land drop)
These card designs have frequently been the best commons in their respective formats and my guess is it will be again
Otherwise, the aim of this deck is to grow as far as you can, amassing creatures with huge numbers of counters to the point where your opponents are overwhelmed by their sheer power