Cheapest priced copy (Aether Revolt): $0.35 at Card Kingdom, near mint, their price list as of .
Restoration Specialist 
Creature — Dwarf Artificer · 2/1 · Uncommon · The List · #AER-21
{W}, Sacrifice this creature: Return up to one target artifact card and up to one target enchantment card from your graveyard to your hand.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Aether Revolt | 21 | Uncommon | $0.35 | $0.49 |
| The List | AER-21 | Uncommon | $0.35 | — |
One ruling from Wizards of the Coast
- 9 February 2017You can activate Restoration Specialist’s ability choosing no targets at all if you wish.