Cheapest priced copy (Tarkir: Dragonstorm): $0.35 at Card Kingdom, near mint, their price list as of .
Karakyk Guardian 
Creature — Dragon · 6/5 · Uncommon · Tarkir: Dragonstorm · #312
Flying, vigilance, trample
This creature has hexproof as long as it hasn't dealt damage yet. (It can't be the target of spells or abilities your opponents control.)
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Tarkir: Dragonstorm | 198 | Uncommon | $0.35 | $0.49 |
| Tarkir: Dragonstorm | 312 | Uncommon | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 4 April 2025If a triggered ability triggers at the same time that Karakyk Guardian deals damage for the first time, targets for that ability are chosen after Karakyk Guardian no longer has hexproof.
- 4 April 2025If Karakyk Guardian leaves the battlefield and returns, it’s considered a new object even if it’s represented by the same card. It has hexproof again until it deals damage.