"One thing that drives some collectors is the accessibility of something, and we all know that eventually the sealed product dries up, so I think there are several people that are taking advantage of the time right now to collect this set before it becomes extremely hard to come by." Chang offers a similar opinion
You also can't sacrifice it to pay a cost that requires you to sacrifice a creature
Also, when you do sacrifice them, you do not have to pay 1 life
Now, which card has been better in Vintage (Type 1) historically
empty Machine/ Effect4000/2800 Cannot be Normal Summoned/Set
Lich-Knights Conquest This reanimation spell is a sort of super-bargain card that wont actually do anything if you dont have artifacts, enchantments, or tokens to sacrifice