Cheapest priced copy (Core Set 2019): $0.49 at Card Kingdom, near mint, their price list as of .
Tezzeret's Gatebreaker 
Artifact · Rare · Core Set 2019 · #289
When this artifact enters, look at the top five cards of your library. You may reveal a blue or artifact card from among them and put it into your hand. Put the rest on the bottom of your library in a random order.
{5}{U}, {T}, Sacrifice this artifact: Creatures you control can't be blocked this turn.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Core Set 2019 | 289 | Rare | $0.49 | — |
One ruling from Wizards of the Coast
- 13 July 2018Because the last ability of Tezzeret’s Gatebreaker doesn’t change the characteristics of any permanents, the set of creatures affected by it is constantly updated. Creatures that come under your control later in the turn can’t be blocked.