Cheapest priced copy (Mystery Booster 2): $6.99 at Card Kingdom, near mint, their price list as of .
Tsabo's Web 
Artifact · Rare · Mystery Booster 2 · #143
When this artifact enters, draw a card.
Each land with an activated ability that isn't a mana ability doesn't untap during its controller's untap step.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
3 printings · $6.99 to $279.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Invasion | 317 | Rare | $37.99 | $279.99 |
| Mystery Booster 2 | 143 | Rare | $6.99 | $6.99 |
| World Championship Decks 2001 | ar317 | Rare | $34.99 | — |
2 rulings from Wizards of the Coast
- 15 April 2013A mana ability is an ability that (1) isn't a loyalty ability, (2) doesn't target, and (3) could add mana when it resolves.
- 8 June 2016Activated abilities contain a colon. They're generally written "[Cost]: [Effect]." Some keywords are activated abilities and will have colons in their reminder text.