Cheapest priced copy (Scars of Mirrodin): $0.35 at Card Kingdom, near mint, their price list as of .
Horizon Spellbomb 
Artifact · Common · Scars of Mirrodin · #165
{2}, {T}, Sacrifice this artifact: Search your library for a basic land card, reveal it, put it into your hand, then shuffle.
When this artifact is put into a graveyard from the battlefield, you may pay {G}. If you do, draw a card.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Scars of Mirrodin | 165 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 15 April 2013When you sacrifice Horizon Spellbomb, it’s search ability goes on the stack, and then the triggered draw ability goes on the stack on top of it. This means you first choose whether to pay {G} and draw a card, then you search; you do not search first.