Pay the cost (if any) at the same time you gain pool from it, you do not get ousted in between.
102121
Villein
Trifle.
Put this card on a vampire you control who has any amount of blood and move 2 to 5 blood from that vampire to your pool. Cards named Minion Tap cost you +1 pool to play. Villein costs +1 pool to play on this vampire.
Rulings
You must be able to pay the cost to play it (eg. cannot play a third Villein with only 1 pool).
If the target has less blood at resolution than the amount announced, you take what you can.