Combine the massive dragon with purple cards such as Merlin, Goat or Yzma, Scary Beyond All Reason to pull them off the table, ready to be played again and reactivate their own powerful effects.
This works out quite well, as Elminster's +2 allows you top draw a card and scry two, reliably allowing access to this cost reduction
Thats on you to decide
The ability to draw cards quickly and efficiently is something that can turn a good deck into a great one, so finding the best card draw spells is a big deal
Hammer of Nazahn Hammer of Nazahn greatly outstrips its creator
So, right off the bat, you can pay one mana, copy Vivi's ability, and generate three mana (you don't get the extra +1/+1 tokens or Vivi's ping, though, since that's a triggered ability