Including as many vampire creatures and other Blood token generators as possible increases the chances you'll be able to put an attacking vampire into play for free whenever Strefan, Maurer Progenitor attacks
Before you ask, yes, this version is shiny
Read More: The best Dragons in Commander 10 Rhystic Study Rhystic Study is an excellent card, and its probably the one on this list that you should include in decks even when you arent trying to annoy people
It stops an attacker, it removes a blocker, it can protect your stuff from a Wrath, yours or theirs, you can kill tokens, you can re-trigger etb effects or you can just say "nothing will be killing my Kaya this turn"
In one out of 20 Prerelease Packs, attendees will find a matching crystal d20 spindown die