REVISED EDITION · 3ED #173

Rock Hydra 3ED #173

Creature — Hydra

Rare | En | Nonfoil only

Representative printing | Regular nonfoil | Main set | Moderate Pricing Confidence

Reserved ListStronger seller depthMarketplaces do not agree

Exact Print Market

Current read

Representative price$4.41NeoPriceConfidenceModeratePricing ConfidenceFinish coverageNonfoil onlyRepresentativeWhat changed-4.8%7-day price movementInventory339Print-level inventorySellers86Print-level sellersUpdatedJul 25, 2026Current

Check firstMarketplaces do not agree, so this price is harder to trust until listings and recent sales line up.

Card-Level Rollup

Market Summary

Updated Jul 25, 2026

Tracked paper printings currently show NeoPrice from $4.41 to $995.00.
A tracked printing's NeoPrice declined 4.8% over the last seven days.
CardTrader currently shows 339 tracked copies, 155 listings, 86 sellers for the tracked printing.
At least one tracked printing has material TCGplayer/CardTrader disagreement.
Pricing Confidence is Moderate based on current marketplace coverage.Learn more

card-level rollup; Moderate Pricing Confidence with 5 supporting signals.

This creature enters with X +1/+1 counters on it. For each 1 damage that would be dealt to this creature, if it has a +1/+1 counter on it, remove a +1/+1 counter from it and prevent that 1 damage. {R}: Prevent the next 1 damage that would be dealt to this creature this turn. {R}{R}{R}: Put a +1/+1 counter on this creature. Activate only during your upkeep.

View Rock Hydra rules and legality

Marketplace Comparison

Compare source coverage

Marketplaces do not agree

Source	Price	Coverage	Updated	Action
NeoPriceNeoCardAlpha market reference	$4.41	Representative print price	Jul 25, 2026	Shown here
TCGplayer Market PricePricing source	$3.67	Market price or search result	Jul 25, 2026	Open TCGplayer
CardTraderInventory source	$5.15	Nonfoil print	Jul 25, 2026	Open CardTrader
Card KingdomValidation only	$2.29	Retail validation only	Not tracked	Open Card Kingdom

Marketplace prices may represent different finish or condition coverage. Check the source listing before comparing.

Source prices are 10.51x apart.

Market Read

What changed

Marketplaces do not agree

What changed

Representative price declined 4.8% over seven days.
Print-level inventory was roughly flat over seven days.
Marketplaces do not agree for this print.
86 tracked sellers for this print.

Why this matters

Price comparison is the main check here: source prices are far enough apart that exact version, condition, and live listings matter before trusting the displayed market read.

What to verify

exact printing and collector number
current marketplace listing
condition bucket
whether marketplaces agree today
whether the representative price matches the copy being compared

Supply

Supply and condition coverage

Updated Jul 25, 2026

Total print inventory339Deep

Listings155Active print-level listings

Sellers86Deep

NM inventory22Near Mint

LP/SP inventory80Lightly/Slightly Played

MP/HP inventory237Moderately/Heavily Played

NM, LP/SP, and MP/HP tracked. Seller and listing counts are tracked for the print overall, not separately by finish or condition.

Other Printings

Compare versions

9 shown

Unlimited Edition2ED | #172 | 1993 | Nonfoil onlyOpen exact printing $45.77ModerateView set

Limited Edition BetaLEB | #172 | 1993 | Nonfoil onlyOpen exact printing $374.19ModerateView set

Limited Edition AlphaLEA | #171 | 1993 | Nonfoil onlyOpen exact printing $995.00Thin MarketPremiumView set

Foreign Black BorderFBB | #173 | 1994 | Nonfoil onlyOpen exact printing $6.00UnratedView set

30th Anniversary Edition30A | #167 | 2022 | Nonfoil onlyOpen exact printing $15.00LowView set

30th Anniversary Edition30A | #464 | 2022 | Nonfoil onlyOpen exact printing $77.07Thin MarketView set

Intl. Collectors' EditionCEI | #172 | 1993 | Nonfoil onlyOpen exact printing $16.22Thin MarketView set

Collectors' EditionCED | #172 | 1993 | Nonfoil onlyOpen exact printing $7.74Thin MarketView set

Summer Magic / EdgarSUM | #173 | 1994 | Nonfoil onlyOpen exact printing No priceUnratedView set

View all Rock Hydra printings

Precomputed Matches

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8 stored matches

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Uthden Troll

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104

Roc of Kher Ridges

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Creature — Bird

104

Two-Headed Giant of Foriys

Reserved

Creature — Giant

Squee, the Immortal

Legendary Creature — Goblin

Gwendlyn Di Corci

Reserved

Legendary Creature — Human Rogue

Bog Wraith

Creature — Wraith

Wall of Bone

Creature — Skeleton Wall

Detailed metricsOpen

Listings	155	Tracked active listings
Vendors	86	Distinct tracked sellers
Liquidity Score	85.0	Deep \| 2565% spread
Liquidity Tier	Deep	2565% spread
Spread	2565% spread	Stable
Market Sensitivity	Low Sensitivity (16/100)	How easily this market could move if pressure increases
Inventory Trend	-0.9%	24h -0.9% \| 7d -0.3%
NeoScore	46	D Tier
Organic Demand	48	Weak organic demand

Sources, methodology, and disclosureOpen

NeoPrice and Pricing Confidence use the existing NeoCardAlpha methodology. CardTrader is the inventory source, TCGplayer is the primary pricing source, and Card Kingdom is validation-only.

TCGplayer CardTrader Card Kingdom Card overview Set page

NeoCardAlpha may earn a commission from certain marketplace links.

Card Kingdom retail validation is visible when a matching product is available, but it remains a validation source.