Cheapest priced copy (The Dark): $4.99 at Card Kingdom, near mint, their price list as of .
Tracker 
Creature — Human · 2/2 · Rare · The Dark · #89
{G}{G}, {T}: This creature deals damage equal to its power to target creature. That creature deals damage equal to its power to this creature.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $4.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The Dark | 89 | Rare | $4.99 | — |
3 rulings from Wizards of the Coast
- 4 October 2004If this leaves the battlefield before its activated ability resolves, it will still deal damage to the targeted creature. On the other hand, if the targeted creature leaves the battlefield before the ability resolves, the ability won't resolve and no damage will be dealt.
- 4 October 2004Giving either creature first strike does not affect the ability.
- 1 October 2009You may have Tracker target itself with its own ability. If you do, Tracker will deal damage to itself equal to its power, then immediately do it again.