Weddings are expensive, and if Crimson Vow is anything to go by, quite dangerous
While it's true that this opens you up to potential blowouts when they wipe the yard with cards like Bojuka Bog or Tormod's Crypt, remember that we're going to be drawing extra cards, too, and we'll be putting cards into the graveyard on most turns, meaning we can recover from a Bog (or Draugr Necromancer) fairly quickly
It's possible players might still be adjusting or havent discovered the newer commons yet, and Thrill just has residual numbers thatll decline in years to come
Giving all your dragons indestructible means you can swing and block without fear, and the bonus of stacking +1/+1 counters every upkeep quickly snowballs, all on top of a potential alternate win condition
Now transformed, you get to take a peek into your opponents hand and force them to discard a card
Lotus Field - Not sure, I have had very few reps against it