Cheapest priced copy (Guilds of Ravnica): $0.49 at Card Kingdom, near mint, their price list as of .
Hatchery Spider 
Creature — Spider · 5/7 · Rare · Guilds of Ravnica · #132
Reach
Undergrowth — When you cast this spell, reveal the top X cards of your library, where X is the number of creature cards in your graveyard. You may put a green permanent card with mana value X or less from among them onto the battlefield. Put the rest on the bottom of your library in a random order.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.49 to $4.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Guilds of Ravnica | 132 | Rare | $0.49 | $1.99 |
| Guilds of Ravnica Promos | 132s | Rare | — | $4.49Out of stock |
5 rulings from Wizards of the Coast
- 5 October 2018Because tokens aren’t cards, they never count for undergrowth abilities.
- 5 October 2018Creature cards with other types, such as artifact creature cards, count for undergrowth abilities.
- 5 October 2018Hatchery Spider’s ability triggers as you cast it, and that ability resolves before the spell itself. It resolves even if that spell is countered.
- 5 October 2018A land card that produces green mana, even a Forest, normally has no color.
- 5 October 2018If a card in your library has {X} in its mana cost, X is considered to be 0.