Cheapest priced copy (March of the Machine): $0.35 at Card Kingdom, near mint, their price list as of .
Portent Tracker 
Creature — Satyr Scout · 1/1 · Common · March of the Machine · #201
{T}: Untap target land.
{T}: Choose target battle. If an opponent protects it, remove a defense counter from it. Otherwise, put a defense counter on it. Activate only as a sorcery.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| March of the Machine | 201 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 14 April 2023Portent Tracker’s first ability isn’t a mana ability. Notably, it can’t be used while you’re activating an ability or casting a spell. If you plan to use it to produce enough mana to activate an ability or cast a spell, you must do so ahead of time.