Cheapest priced copy (Modern Horizons): $0.49 at Card Kingdom, near mint, their price list as of .
Throatseeker 
Creature — Vampire Ninja · 3/2 · Uncommon · Modern Horizons · #110
Unblocked attacking Ninjas you control have lifelink.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $0.49 to $4.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Modern Horizons | 110 | Uncommon | $0.49 | $4.49 |
2 rulings from Wizards of the Coast
- 14 June 2019If an unblocked attacking Ninja you control leaves combat (most likely because the combat phase has ended), it no longer has lifelink.
- 14 June 2019Throatseeker’s effect applies only after blockers have been declared. Before then, attacking creatures are neither blocked nor unblocked.