Cheapest priced copy (Commander 2020): $0.99 at Card Kingdom, near mint, their price list as of .
Nahiri, the Harbinger 
Legendary Planeswalker — Nahiri · Mythic · Shadows over Innistrad · #247
+2: You may discard a card. If you do, draw a card.
−2: Exile target enchantment, tapped artifact, or tapped creature.
−8: Search your library for an artifact or creature card, put it onto the battlefield, then shuffle. It gains haste. Return it to your hand at the beginning of the next end step.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
5 printings · $0.99 to $9.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2020 | 223 | Mythic | $0.99 | — |
| Commander Masters | 929 | Mythic | $0.99 | — |
| Mythic Edition | WS7 | Mythic | — | $9.49 |
| Shadows over Innistrad Promos | 247s | Mythic | — | $9.49 |
| Shadows over Innistrad | 247 | Mythic | $0.99 | $3.49 |
3 rulings from Wizards of the Coast
- 8 April 2016You can activate Nahiri’s first ability with no intention of discarding a card just to add loyalty to Nahiri.
- 8 April 2016If the artifact or creature put onto the battlefield with Nahiri’s third ability leaves the battlefield before the next end step, it won’t be returned to your hand from its new zone.
- 8 April 2016If you find a noncreature artifact with Nahiri’s third ability, it will still gain haste, even though it won’t be meaningful unless that artifact becomes a creature.