Cheapest priced copy (Planeshift): $0.35 at Card Kingdom, near mint, their price list as of .
Exotic Disease 
Sorcery · Uncommon · Planeshift · #43
Domain — Target player loses X life and you gain X life, where X is the number of basic land types among lands you control.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $0.35 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Planeshift | 43 | Uncommon | $0.35 | $0.99 |
2 rulings from Wizards of the Coast
- 18 June 2021The basic land types are Plains, Island, Swamp, Mountain, and Forest. Land types other than basic land types (such as Desert) don't contribute to domain abilities.
- 18 June 2021Domain abilities count the number of basic land types among lands you control, not how many lands you control or how many of any type.