Strefan, Maurer Progenitor (Extended Art) (VOC-040) - Crimson Vow Commander: (Extended Art)

Flying
At the beginning of your end step, create a Blood token for each player who lost life this turn.
Whenever Strefan attacks, you may sacrifice two Blood tokens. If you do, you may put a Vampire card from your hand onto the battlefield tapped and attacking. It gains indestructible until end of turn.