Cheapest priced copy (March of the Machine): $0.35 at Card Kingdom, near mint, their price list as of .
Swordsworn Cavalier 
Creature — Human Knight · 3/1 · Common · March of the Machine · #42
This creature has first strike as long as another Knight entered the battlefield under your control this turn.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| March of the Machine | 42 | Common | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 14 April 2023If Swordsworn Cavalier enters the battlefield, leaves the battlefield, and returns to the battlefield all in the same turn, it will have first strike that turn. It will have no connection to the object it was and see it as “another Knight.”
- 14 April 2023Swordsworn Cavalier will continue to have first strike even if the other Knight that entered the battlefield that turn has since left the battlefield, has since stopped being a Knight, or another player has gained control of it.