Cheapest priced copy (Guildpact): $0.35 at Card Kingdom, near mint, their price list as of .
Petrahydrox 
Creature — Weird · 3/3 · Common · Guildpact · #148
({U/R} can be paid with either {U} or {R}.)
When this creature becomes the target of a spell or ability, return this creature to its owner's hand.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Guildpact | 148 | Common | $0.35 | $0.49 |
| Ravnica Remastered | 209 | Common | $0.35 | $0.49 |
3 rulings from Wizards of the Coast
- 12 January 2024Petrahydrox's ability triggers only if it's on the battlefield when it becomes the target of a spell or ability.
- 12 January 2024Petrahydrox's ability resolves before the spell or ability that caused it to trigger. It resolves even if that spell or ability is countered.
- 12 January 2024If the spell or ability that targets Petrahydrox has no other targets, it won't resolve (because it no longer has a legal target after Petrahydrox has returned to its owner's hand).