So unless something impacts it greatly (like one of the Three Rs) it will not drop in price
Slip Out the Back is the most expensive and one of the only efficient options right now, utilizing a single-target phasing
Illustrated by Aaron Miller Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp
For the most part, this is what youll be getting from these boosters, so if you find this style, I dont know, ugly and lazy, then you may want to consider just buying singles of the new cards available like the Brothers Hildebrandt cards or other new treatments
On the other hand, the Vampire deck actually has the most value tied up in colorless cards
Plus, being an enchantment makes it harder to remove than something like Tortured Existence