For high-value cards, professional grading is the single most reliable way to establish a verifiable price
In fact, there are times Ive not even been able to make Blue mana for Demand and Supply is good enough already
Being able to not only create more problems for your opponents to deal with, but then also either rob them of their cards or draw more yourself is an amazing suite of abilities
As long as Kouzuki Momonosuke is in play, Leader Yamato will be at 6,000 Power during your turn, going for heavier attacks to threaten the opponents Life cards
It is easier to cast, generally has a more potent removal effect, can scale up in power, and has that valuable lifegain option
With Neera in play, you can choose to put the spell youre casting on the bottom of your library, and flip cards off of the top until you get a nonland card, which you can then cast for free