Cheapest priced copy (Time Spiral): $0.35 at Card Kingdom, near mint, their price list as of .
Outrider en-Kor 
Creature — Kor Rebel Knight · 2/2 · Uncommon · Time Spiral · #31
Flanking (Whenever a creature without flanking blocks this creature, the blocking creature gets -1/-1 until end of turn.)
{0}: The next 1 damage that would be dealt to this creature this turn is dealt to target creature you control instead.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $0.35 to $3.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Time Spiral | 31 | Uncommon | $0.35 | $3.99 |
| Time Spiral Remastered | 30 | Uncommon | $0.35 | $0.99 |
3 rulings from Wizards of the Coast
- 19 March 2021The damage dealt to the target is dealt by the original source of damage, not by Outrider en-Kor.
- 19 March 2021After Outrider en-Kor's activated ability has resolved, if multiple sources would deal damage to Outrider en-Kor simultaneously that turn (which can happen if Outrider en-Kor is blocked by multiple creatures, for example), you choose which source has its 1 damage redirected. If Outrider en-Kor's ability has resolved more than once that turn, you may choose a different source for each redirection effect.
- 19 March 2021If the targeted creature leaves the battlefield after the activated ability resolves but before Outrider en-Kor would be dealt damage, the damage isn't redirected away from Outrider en-Kor. The same is true if the target is no longer a creature (or a planeswalker) at that time.