Petrahydrox
Creature — Weird
GPTGuildpact#148common
Foil
It departs through the streets' fissures with a sound like gravel pouring into a pond.
- Border
- black
- Frame
- 2003
- Pull rate
- about 2 per booster–1 in 350
- Illustrator
- Anthony S. Waters
- Found in
- Guildpact Theme Deck Izzet Gizmometry · Guildpact MTGO Redemption · 2 more
CommanderLegalModernLegalStandardNot legal
Format legality
AlchemyNot legal
BrawlNot legal
CommanderLegal
Competitive BrawlNot legal
DuelLegal
Future StandardNot legal
GladiatorNot legal
HistoricNot legal
LegacyLegal
ModernLegal
OathbreakerLegal
Old SchoolNot legal
PauperLegal
Pauper CommanderLegal
PennyLegal
PioneerNot legal
PreDHLegal
PremodernNot legal
StandardNot legal
Standard BrawlNot legal
TimelessNot legal
Tiny LeadersNot legal
VintageLegal
( can be paid with either 
or 
.)
When this creature becomes the target of a spell or ability, return this creature to its owner's hand.
3/3 can be paid with either or .)
When this creature becomes the target of a spell or ability, return this creature to its owner's hand.Market · per finishspark updated 11h ago · prices as of 2026-07-12
Nonfoil+0.0%
$0.05
$0.01 low$0.00 gap
Foil+0.0%
$0.21
$0.17 low$0.09 gap
Finish
Market
Δ 7D · Trend
Low
Buylist
Buy / Sell Gap
Nonfoil
$0.05as of 2026-07-12
+0.0%
H $0.05L $0.02since Feb 2024$0.01
$0.01
$0.000% · normal spread
VenuesHide venues
Low: tcgplayer
Buylist: cardkingdom
Foil
$0.21as of 2026-07-12
+0.0%
H $0.33L $0.21since Feb 2024$0.17
$0.08
$0.09+53% · normal spread
VenuesHide venues
Low: tcgplayer
Buylist: cardkingdom
Cheapest playable copy$0.05· across 2 printings
Rulings
3 · latest Jan 12, 2024 · one tap opens all
- WotCJan 12, 2024
If 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).
- WotCJan 12, 2024
Petrahydrox's ability resolves before the spell or ability that caused it to trigger. It resolves even if that spell or ability is countered.
- WotCJan 12, 2024
Petrahydrox's ability triggers only if it's on the battlefield when it becomes the target of a spell or ability.