Cheapest priced copy (Conflux): $0.35 at Card Kingdom, near mint, their price list as of .
Aven Trailblazer 
Creature — Bird Soldier · 2/* · Common · Conflux · #4
Flying
Domain — Aven Trailblazer's toughness is equal to the number of basic land types among lands you control.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Conflux | 4 | Common | $0.35 | $0.49 |
3 rulings from Wizards of the Coast
- 1 February 2009Aven Trailblazer's second ability is a "characteristic-defining ability." It applies at all times in all zones.
- 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.