Vampiric Deep Tomb

At the beginning of your end step, you may
pay X life. If you do, draw X cards.
Whenever you draw a card, if it's not the
first card you've drawn this turn, create a 0/1
black Vampire creature token with Menace.
When Vampiric Deep Tomb enters the
battlefield, search your library for a card
named Sanctum Seeker and put it into
the battlefield under your control.