Cheapest priced copy (Tarkir: Dragonstorm Promos): $0.49 at Card Kingdom, near mint, their price list as of .
Lasyd Prowler 
Creature — Snake Ranger · 5/5 · Rare · Tarkir: Dragonstorm · #348
When this creature enters, you may mill cards equal to the number of lands you control.
Renew — {1}{G}, Exile this card from your graveyard: Put X +1/+1 counters on target creature, where X is the number of land cards in your graveyard. Activate only as a sorcery.
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
4 printings · $0.49 to $0.59 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Tarkir: Dragonstorm Promos | 149p | Rare | $0.49 | $0.49 |
| Tarkir: Dragonstorm Promos | 149s | Rare | — | $0.59 |
| Tarkir: Dragonstorm | 149 | Rare | $0.49 | $0.49 |
| Tarkir: Dragonstorm | 348 | Rare | $0.49 | $0.49 |
3 rulings from Wizards of the Coast
- 4 April 2025The value of X is calculated only once, as Lasyd Prowler’s renew ability resolves.
- 4 April 2025If you don’t have at least as many cards in your library as lands you control when Lasyd Prowler’s first ability resolves, you can’t choose to mill that many cards.
- 4 April 2025If a card with a renew ability is put into your graveyard during your turn, you can activate that ability if it’s legal to do so before any other player can take any actions.