Did you read this topic? It has most of the points said. But if offline solo against COMs, it honestly doesn't matter since COMs are dumb anyways.
While solo Viviana is incomparable to tech damage compared to Glustar or the effectiveness with using multiple techs as Ino'lis, she's stellar on long games, which is the point of using her - maintain a long battle so she can get a high EX boost. While Ino'lis and Glustar are offense-oriented, Viviana is defense-oriented.
Sacrificing various cards in favor of Assist Cards is not a necessity (as seen earlier in this thread), but will raise her EX fairly well depending how you approach getting the EX; for example, Dice Fever/Charity approach (you have to set Charity on yourself) is an instant 4 EXP each time when it comes your turn; Dice Fever will guarantee you to set a Rukmin as well on your next turn which means after that, if everything goes smoothly, your next turn you will have a +7 EX boost already (2 on your opponent's turn for rolling two 5's, 2 from your own dice rolls, 3 from Rukmin). That means in 3 turns, you would have received an EX boost +1, again, assuming everything goes out correctly; by 4 turns, you would have received EX boost +2, etc. And again, this is all if you want to take this approach; there are many other different approaches as well.
Certainly, a small field will create problems for Viviana (especially so if you get low dice rolls), but you would have known that before hand anyways with any character that has 2 MV space; generally, if your items somehow do get destroyed (not intentionally obviously), then it's an advantage for you since it means you could use Requiem and Bequeath. Depending if you like Bequeath or not, you could get somewhere between 1-3 EX for most items being destroyed; Rukmin would gain you +4 EX if Bequeath is used on it when it is destroyed. Requiem is number of items destroyed x2 so that adds up pretty fast. Most cases, a shield would be set by the end of your next turn which would reduce the attacks to it only; only in the absolute worst case scenario where you can't set anything will you be in trouble (although this would apply to any character and not just Viviana).
Anyways I'm moving off the point now so I'll stop. tl;dr - Viviana is meant for defense and prolong games for solo; if you want offense fast games, Glustar and Ino'lis top her significantly.
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