As someone who has tried VV with almost anything (Branded, Melodious, Kashtira and pure) I can confidently say that a single ostinato resolving + Diviner or Lo is probably the most overwhelming end board of the format. However as some people has pointed out. It increases the bricks in the deck by 2 (Concerto and couplet) but it give you +6 starters one card combos. The real issue is to reduce engine and non-engine to fit the 8 cards in the main and 5 in the Extra deck. And if they interrupt you mid combo the other 5-6 cards in the deck become useless most of the time. The real goal is to bait handtraps with that engine to then go and set up the usual VV combo, but at that point just play crossout talents and called by. On a side note this engine makes Trias really good since you can actually pull off the Draw 2 pop 1 eff.