Describe the bug
Gemstone Caverns has a "pregame action" (an effect that triggers if it's in your opening hand: exile it, then if you do, return it to the battlefield at the beginning of your first upkeep with a luck counter on it). In Forge, this pregame action does not trigger/offer — the card is never put onto the battlefield via its pregame ability, so it just sits in hand like a normal land with no way to play it early.
To Reproduce
Steps to reproduce the behavior:
- Build/load a deck containing Gemstone Caverns.
- Start a game (desktop client) and mulligan/keep until Gemstone Caverns is in your opening hand.
- Observe the start of the game / your first upkeep — no prompt or trigger appears offering to exile Gemstone Caverns for its pregame action.
- Gemstone Caverns remains a normal card in hand; it can only be played as a land on a turn via a regular land drop, with no luck counter and without entering during the first upkeep.
Expected behavior
At the start of the game, if Gemstone Caverns is in the player's opening hand, the game should ask the player whether to exile it. If exiled, Gemstone Caverns should return to the battlefield with a luck counter on it at the beginning of that player's first upkeep, per its printed pregame action.
Screenshots
N/A (logic/trigger issue, not a visual issue).
Desktop (please complete the following information):
- OS: [fill in — e.g. Windows 11 / Arch Linux / macOS]
- Browser: N/A (Java desktop client, not browser-based)
- Version: [fill in Forge build/commit version, e.g. from Help > About]
Smartphone (please complete the following information):
- Device: N/A
- OS: N/A
- Version: N/A
Additional context
"Pregame actions" are a relatively rare mechanic (Gemstone Caverns, Leyline cycles, etc. use similar opening-hand triggers). It's possible Forge's engine doesn't have general support for cards with this opening-hand/pregame timing, in which case this may affect other pregame-action cards as well, not just Gemstone Caverns. Worth checking whether Leyline-cycle cards (which have a similar "you may begin the game with this on the battlefield if it's in your opening hand" wording) work correctly, to determine if this is a Gemstone-Caverns-specific scripting bug or a missing general pregame-action framework.
Describe the bug
Gemstone Caverns has a "pregame action" (an effect that triggers if it's in your opening hand: exile it, then if you do, return it to the battlefield at the beginning of your first upkeep with a luck counter on it). In Forge, this pregame action does not trigger/offer — the card is never put onto the battlefield via its pregame ability, so it just sits in hand like a normal land with no way to play it early.
To Reproduce
Steps to reproduce the behavior:
Expected behavior
At the start of the game, if Gemstone Caverns is in the player's opening hand, the game should ask the player whether to exile it. If exiled, Gemstone Caverns should return to the battlefield with a luck counter on it at the beginning of that player's first upkeep, per its printed pregame action.
Screenshots
N/A (logic/trigger issue, not a visual issue).
Desktop (please complete the following information):
Smartphone (please complete the following information):
Additional context
"Pregame actions" are a relatively rare mechanic (Gemstone Caverns, Leyline cycles, etc. use similar opening-hand triggers). It's possible Forge's engine doesn't have general support for cards with this opening-hand/pregame timing, in which case this may affect other pregame-action cards as well, not just Gemstone Caverns. Worth checking whether Leyline-cycle cards (which have a similar "you may begin the game with this on the battlefield if it's in your opening hand" wording) work correctly, to determine if this is a Gemstone-Caverns-specific scripting bug or a missing general pregame-action framework.