Cheapest priced copy (Crimson Vow Commander): $1.29 at Card Kingdom, near mint, their price list as of .
The Devil Strahd 
Strefan, Maurer Progenitor
Legendary Creature — Vampire Noble · 3/2 · Mythic · Secret Lair Drop · #2501
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.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
4 printings · $0.99 to $7.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Crimson Vow Commander Display Commanders | 2 | Mythic | — | — |
| Secret Lair Drop (The Devil Strahd) | 2501 | Mythic | $7.99 | $6.49 |
| Crimson Vow Commander | 2 | Mythic | $1.29 | $0.99 |
| Crimson Vow Commander | 40 | Mythic | $2.49 | — |
One ruling from Wizards of the Coast
- 19 November 2021Strefan's first triggered ability counts the number of players that lost any amount of life, even if they also gained that much or more life this turn.