When Forerunner of the Legion enters the battlefield, you may search your library for a Vampire card, reveal it, then shuffle your library and put that card on top of it.
Whenever another Vampire enters the battlefield under your control, target creature gets +1/+1 until end of turn.
Equipped creature gets +3/+3.
Whenever equipped creature attacks, it doesn't untap during its controller's next untap step.
Whenever Stitcher's Graft becomes unattached from a permanent, sacrifice that permanent.