Play/Steal Rack without ready vampire
As this card is played or the controller of this card changes, the controller chooses a ready vampire they control. During the controller's unlock phase, the chosen vampire can gain 2 blood. A vampire controlled by another Methuselah can steal this location as a Ⓓ action.
Can you play or steal Rack if you have no ready vampire?
Any effects that would send the vampire to torpor or burn them (Daring the Dawn, Day Operation) as part of the action occur after the action is resolved and part of that resolution would be targeting a ready vampire. I can't see a case where this problem would even come up.
Ankha wrote: Thanks for pointing out the interaction with the new rule. For now, you cannot "play" the Grotesque if you cannot fulfill the choice (that is a location not already chosen by another Grotesque). It is similar to The Rack when you control no ready vampire.