This only applies to scheduled side events
For Commander Decks you're talking anything beyond $60/50, while Play Booster Boxes at $180/160 or more are overly expensive
It takes any Vampire deck and gives them different modes of attack, as the -3 ability can immediately accelerate a larger threat on the battlefield that your opponents must deal with immediately
As I stated in that article, lands and hybrid spells are exceptions here, though I was hopeful for some absurd Naya card to really shake things up
As a baseline example of how messy this can get, imagine playing Dark Depths and sacrificing it to, say, Crop Rotation
On the other hand, this is exactly how we found out about the Splinter Twin ban last year