Cheapest priced copy (Commander 2017): $2.99 at Card Kingdom, near mint, their price list as of .
Anowon, the Ruin Sage 
Legendary Creature — Vampire Shaman · 4/3 · Rare · Worldwake · #49
At the beginning of your upkeep, each player sacrifices a non-Vampire creature of their choice.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
3 printings · $2.99 to $29.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2017 | 96 | Rare | $2.99 | — |
| Crimson Vow Commander | 118 | Rare | $2.99 | — |
| Worldwake | 49 | Rare | $3.99 | $29.99 |
2 rulings from Wizards of the Coast
- 1 March 2010When the triggered ability resolves, first you choose which creature you'll sacrifice (if you control any non-Vampire creatures), then each other player in turn order does the same, then all chosen creatures are sacrificed at the same time.
- 1 March 2010If a player controls no creatures, or if all creatures a player controls are Vampires, that player simply doesn't sacrifice anything.