Gemstone Caverns
4% of tracked Commander decks run Gemstone Caverns, yet when it does hit a hand it's cast 71% of the time, with a median first-cast turn of 2.5.
Gemstone Caverns earns its spot on the basis of one unique proposition: it is the only land in Commander that can enter the battlefield during the mulligan phase, giving non-first-seat players a free mana advantage before a single turn begins. Playgroup Live tracks it in 4% of decks across 1205 multiplayer games, a niche but deliberate inclusion.
When a copy reaches a player's hand, it converts to a cast at a rate of 71%. That gap between drawn and cast is mostly a timing artifact: copies drawn in the late game have nothing to do with the opening-hand trick and may not be played before the game ends. The median first-cast turn of 2.5 is deceptively low because a large cluster of casts happen on turn 1, pulled forward by the opening-hand ability. Once it resolves, 87% of cast copies remain on the battlefield at game end, consistent with its role as a simple mana source.
Commander decks with colorless commanders or five-color piles show the highest representation, where a free colored mana source in the opening hand carries outsized value. The card is legal in Commander, Duel Commander, Legacy, Modern, and Vintage, though its design is most impactful in multiplayer formats where turn order creates the most variance.
- 4% of tracked Commander decks include Gemstone Caverns
- 71% of drawn copies are cast before the game ends
- T2.5 median first-cast turn, skewed early by opening-hand deployments
- 87% battlefield stickiness once the land resolves
- 482 distinct players have brought it to a tracked game, spreading the data well
- 35% win rate in participations where Gemstone Caverns was cast (normalized to 4-player baseline)
First-cast turn
n=252The "good card" funnel
1526 brought · 482 playersOf 1526 Gemstone Caverns brought to games, 355 were drawn and 252 of those were cast, with most resolved copies remaining on the battlefield through the end of the game.
Players who cast this card win 35% of the time (n=233) , vs 30% when it never left the library (n=930).
When players drew this card but left it in hand, they won 44% (n=88) — about the same as leaving it in the library. Those players survived long enough to draw it, so the gap above is about the card resolving, not just about surviving.
Observed gap +5.4pp; 95% confidence interval -0.6pp to +11.4pp. Correlational, not causal: powerful payoffs also get cast more often in games you are already winning.
Final zone distribution
408 instancesThe vast majority of Gemstone Caverns copies never leave the library, a baseline expectation for any singleton in a 100-card deck. The cards that do resolve tend to stay on the battlefield through end of game at 87%, matching its role as a simple, stable mana source.
Commanders that played this card
in tracked games- 1 Zhulodok, Void Gorger 17 decks
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2
Kinnan, Bonder Prodigy
16 decks
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3
Etali, Primal Conqueror // Etali, Primal Sickness
15 decks
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4
Rograkh, Son of Rohgahh
14 decks
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5
Sauron, the Dark Lord
13 decks
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6
Lumra, Bellow of the Woods
11 decks
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7
Winota, Joiner of Forces
11 decks
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8
Kaalia of the Vast
10 decks
- 9 Molecule Man 10 decks
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10
Tymna the Weaver
10 decks
The commander spread is wide, with no single archetype dominating. Colorless commanders, five-color piles, and aggressive tempo builds all appear near the top, reflecting how universally the opening-hand ability is valued across strategies.
Gemstone Caverns
: Add 
. If Gemstone Caverns has a luck counter on it, instead add one mana of any color.