Cheapest priced copy (Final Fantasy Commander): $0.49 at Card Kingdom, near mint, their price list as of .
Tireless Tracker 
Creature — Human Scout · 3/2 · Rare · March of the Machine Commander · #314
Landfall — Whenever a land you control enters, investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this token: Draw a card.")
Whenever you sacrifice a Clue, put a +1/+1 counter on this creature.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
17 printings · $0.49 to $29.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Edge of Eternities Commander | 110 | Rare | $0.59 | — |
| Final Fantasy Commander | 316 | Rare | $0.49 | $0.49 |
| Innistrad Remastered | 219 | Rare | $0.49 | $0.79 |
| Innistrad Remastered | 318 | Rare | $1.49 | $1.99 |
| Foundations Jumpstart | 729 | Rare | $0.49 | — |
| Murders at Karlov Manor Commander | 190 | Rare | $0.49 | — |
| March of the Machine Commander | 314 | Rare | $0.49 | — |
| Fallout | 207 | Rare | $0.59 | $0.79 |
| Fallout | 472 | Rare | $0.59 | $0.79 |
| Fallout | 735 | Rare | — | $2.49 |
| Fallout | 1000 | Rare | — | $2.49 |
| The List | SOI-233 | Rare | $0.59 | — |
| Shadows over Innistrad Promos | 233s | Rare | — | $4.99Out of stock |
| Secret Lair Drop | 711 | Rare | $2.49 | $3.99 |
| Secret Lair Drop | 1094 | Rare | $2.29 | $2.49 |
| Shadows over Innistrad | 233 | Rare | $0.69 | $1.49Out of stock |
| Special Guests | 26 | Mythic | $5.99 | $29.99 |
8 rulings from Wizards of the Coast
- 2 February 2024Some abilities trigger "whenever you sacrifice a Clue". Those abilities trigger whenever you sacrifice a Clue for any reason, not just to activate a Clue's activated ability.
- 2 February 2024You can't sacrifice a Clue to pay multiple costs. For example, you can't sacrifice a Clue token to activate its own ability and also to activate Alquist Proft, Master Sleuth's ability.
- 2 February 2024Clue is an artifact type. Even though it appears on some cards with other permanent types, it's never a creature type, a land type, or anything but an artifact type.
- 2 February 2024Some spells and abilities that investigate may require targets. If each target chosen is an illegal target as that spell or ability tries to resolve, it won't resolve. You won't create any Clue tokens.
- 2 February 2024If an effect refers to a Clue, it means any Clue artifact, not just a Clue artifact token. For example, you can sacrifice Wrench to pay for Alquist Proft, Master Sleuth's activated ability.
- 25 July 2025A landfall ability doesn't trigger if a permanent already on the battlefield becomes a land.
- 25 July 2025A landfall ability triggers whenever a land you control enters for any reason. It triggers whenever you play a land, as well as whenever a spell or ability puts a land onto the battlefield under your control.
- 25 July 2025Whenever a land you control enters, each landfall ability of permanents you control will trigger. You can put them on the stack in any order. The last ability you put on the stack will be the first one to resolve. As a result, you can have those abilities resolve in the order of your choosing.