Vampiric Inquisition

When you cast Vampiric Inquisition, you may tap any number of Vampire creatures you control. Vampiric Inquisition costs {1} less to play for every creature tapped this way.
Players play with the top card of their decks revealed. If the top card is a Vampire card, that player may play that card as if it was in their hand.
Tap a Vampire creature you control: target player discards the top card of their library.