Cheapest priced copy (Core Set 2020): $0.35 at Card Kingdom, near mint, their price list as of .
Pattern Matcher 
Artifact Creature — Golem · 3/3 · Uncommon · Core Set 2020 · #234
When this creature enters, you may search your library for a card with the same name as another creature you control, reveal it, put it into your hand, then shuffle.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Core Set 2020 | 234 | Uncommon | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 12 July 2019You may choose to search your library for nothing and shuffle it, even if you control no other creatures.
- 12 July 2019If a second Pattern Matcher enters the battlefield under your control, you can have it look at the first Pattern Matcher to search for a third Pattern Matcher.