You can play it, and it will resolve. If you take 2 pool from the target
vampire, you'll end with 2 pool (pay 1 for the Minion Tap and gain 2 from the
vampire).
If there were two Villein's in play, though, you couldn't play it, since you
can't pay the 2-pool cost with only 1 pool.
Thanks
Just remember that playing a short term investment, even if you have
anson and parthenon in play, when n you are at 1 pool, still means you
die as you do not have time to remove a blood from it.