Cheapest priced copy (Modern Horizons 2): $0.49 at Card Kingdom, near mint, their price list as of .
Breya's Apprentice 
Artifact Creature — Human Artificer · 2/3 · Rare · Modern Horizons 2 · #455
When this creature enters, create a 1/1 colorless Thopter artifact creature token with flying.
{T}, Sacrifice an artifact: Choose one —
• Exile the top card of your library. Until the end of your next turn, you may play that card.
• Target creature gets +2/+0 until end of turn.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
3 printings · $0.49 to $1.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Modern Horizons 2 | 117 | Rare | $0.49 | $1.49 |
| Modern Horizons 2 | 455 | Rare | $0.79 | $0.49 |
| Modern Horizons 2 Promos | 117s | Rare | — | $1.29 |
3 rulings from Wizards of the Coast
- 18 June 2021You can sacrifice any artifact, not just a Thopter.
- 18 June 2021If you choose the first mode, you must still pay any costs and follow any timing restrictions to play the card.
- 18 June 2021The exiled card is exiled face up.