Cheapest priced copy (Commander 2015): $1.79 at Card Kingdom, near mint, their price list as of .
Teysa, Envoy of Ghosts 
Legendary Creature — Human Advisor · 4/4 · Rare · Dragon's Maze · #108
Vigilance, protection from creatures
Whenever a creature deals combat damage to you, destroy that creature. Create a 1/1 white and black Spirit creature token with flying.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
3 printings · $1.79 to $2.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2015 | 234 | Rare | $1.79 | — |
| Commander 2021 | 230 | Rare | $1.99 | — |
| Dragon's Maze | 108 | Rare | $1.99 | $2.99 |
4 rulings from Wizards of the Coast
- 15 April 2013Protection from creatures means that Teysa, Envoy of Ghosts can’t be the target of abilities of creatures or abilities of creature cards in other zones, such as bloodrush abilities. Teysa also can’t be blocked by creatures, and all damage that would be dealt to Teysa by creatures is prevented.
- 15 April 2013Teysa’s last ability doesn’t target the creature. It will destroy a creature with hexproof or protection from white, for example.
- 15 April 2013Teysa’s controller gets the Spirit creature token, not the controller of the creature that dealt combat damage.
- 1 July 2013You get a Spirit creature token even if Teysa’s triggered ability doesn’t destroy the creature (perhaps because it regenerated or has indestructible).