Pool Cost: 2
Tap to transfer equipment cards, move blood and transfer retainers between any two ready vampires you control. (You may choose the amount of blood you move and which cards you transfer.) Cannot be used during an action.
Clarifications and Rulings
May not be tapped "during" paying some cost - must be tapped before or after. [SFC 19960830]
Heidelburg Castle may not be tapped "in response" to any instant effect (because all effects in V:TES are instantaneous except for actions and certain combat effects). [LSJ]