Core Mechanics
Set / Face-Down Mechanic
The set system is Gambit's core social and bluffing layer. It creates uncertainty, mindgames, and strategic depth in every game.
Rules
- Any card of any type can be set face-down into a Set Zone (units, spells, traps, and items)
- No cost is paid when setting -- payment happens when the card is activated or played from set position
- Set cards are placed face-down -- opponents cannot see what they are
Behavior by Card Type
| Card Type | Set Behavior |
|---|---|
| Units | Reserved for later. Flip face-up on your turn and pay the cost to play normally. |
| Spells | Reserved for later use. Activate on your turn only. |
| Traps | Activate at declared trigger windows during any player's turn. Must wait one full turn. |
| Items | Reserved for later. Flip and pay on your turn to equip. |
The Bluff
Opponents cannot distinguish between a set trap, a reserved unit, a stored spell, or a held item. A player who sets a weak 1-cost unit looks identical to one who sets a devastating trap. This creates:
- Reading opponents -- is that set card a threat or a bluff?
- Energy deception -- setting a card you can't afford yet hides your energy limitations
- Trap anxiety -- opponents must decide whether to play around potential traps or call the bluff
Counterplay
- White's Reveal mechanic -- White cards can force a set card to be flipped face-up, exposing the bluff. Reveal cards can carry a variety of effects beyond the reveal itself (e.g., declaring the card's type for +1 life if correct, returning the revealed card to hand, increasing its cost to play, etc.).
Board State & Zone Limits
Each player's board has defined zones with maximum capacities. Limits keep the board readable, force strategic choices about what to commit, and ensure hand payment remains relevant alongside the Energy Zone.
Zones
| Zone | Max Capacity | Contents |
|---|---|---|
| Unit Zone | 5 | Active units on the field |
| Set Zone | 5 | Face-down cards only (traps, reserved spells/units/items) |
| Energy Zone | Equal to max hand size | Face-up energized cards that generate energy |
| Field Zone | 1 | One persistent field-wide effect (Field Relic or Field Spell) |
| Items | 1 per unit | Equipped to units (destroyed with host) |
| Bench | 1 | Knocked-out Ace (Ace Battle format only) |
| Graveyard | No limit | Discarded/destroyed cards |
| Exile | No limit | Exiled cards (cannot be recycled) |
Why Cap Energy at Hand Size?
Tying the Energy Zone to max hand size creates an elegant ceiling:
- You can never energize more permanent sources than the number of cards you draw each turn
- Hand payment stays relevant throughout the game -- even at max energy, big plays require discarding from hand
- Green's Conduit cards (counting as 2 energy) become especially valuable since they stretch the cap without taking an extra slot
Item Limits
1 item per unit. Each unit can have a single item equipped. This makes each equipment choice high-stakes -- you're picking the item for that unit, not building a loadout. Items are destroyed and sent to the graveyard when their host unit is destroyed -- they do not return to hand or persist unattached. Cursed Items are especially punishing since they block the unit's only item slot.
Field Zone
A single shared slot for one persistent field-wide effect. The Field Zone can hold either:
- A Field Relic -- a persistent artifact providing an ongoing effect (requires relic removal to destroy)
- A Field Spell -- a continuous spell providing an ongoing effect (requires spell nullification to destroy)
Only 1 field card can be active at a time. Playing a new field card replaces the existing one (old card goes to graveyard). The counterplay differs by type, so knowing whether an opponent's field card is a relic or spell matters for building answers.
Set Zone Clarification
The Set Zone contains only face-down cards. If a set card is revealed (e.g., by White's Reveal mechanic), it remains in the Set Zone but is not considered in play -- it is simply exposed. Revealed set cards can still be activated/played normally on a later turn.
Voluntary Destruction
Players cannot voluntarily send their own cards to the graveyard. Cards are only removed through:
- Card effects (Sacrifice keyword, destroy effects, discard effects)
- Combat (unit destroyed by damage)
- Replacement (playing a new field card over an existing one)
This makes Black's Sacrifice keyword essential for graveyard fueling and ensures Cursed Items are genuinely difficult to remove without the right answer cards.
First-Player Balance (1v1)
Going first grants tempo advantage (energize first, play first, attack first). To compensate, player 2 receives:
- +1 card -- draws an extra card at the start of the game (hand of 6 vs 5)
- Free set -- may set 1 card face-down before the game begins, at no cost
Player 1 has tempo; player 2 has resources and a loaded bluff on the board. Every game starts with a mindgame.
Multiplayer compensation is deferred until FFA format design -- seat position bonuses will need to scale with turn order.
Turn Structure
Split-phase system with end-of-turn draw for fast-paced play with meaningful energy tension.
Phases
| # | Phase | Description |
|---|---|---|
| 1 | Main Phase 1 | Play cards, energize cards, set cards face-down, equip items |
| 2 | Combat | Declare attackers (choose target player), defender chooses blockers, resolve |
| 3 | Main Phase 2 | Play more cards after combat results are known |
| 4 | Draw Phase | Draw up to max hand size |
| 5 | End Phase | End-of-turn effects resolve, cleanup |
Why End-of-Turn Draw?
Drawing at the end of your turn creates a natural tension curve:
- Early game: Your hand is your most precious resource. Activating traps on opponents' turns (by discarding hand cards) costs you options on your next turn. Every card spent off-turn is a card you won't have.
- Late game: As your Energy Zone grows, energized cards cover most costs. Traps become easier to activate without sacrificing your hand, and your draw phase refills you with pure options.
This progression rewards smart early energizing and makes the game feel increasingly powerful as it develops.
Trap Windows
Traps can activate at phase transitions on any player's turn, not just the active player's. Specific trigger windows are declared when the trap is set.
OPEN QUESTION: Fast-turn variant rules for 4+ player games to prevent downtime. Options include simultaneous phases, action limits, or timers.
Combat System
Player Targeting
- Players are always targetable. Every player has a life total and can be attacked directly. Players have no equipment -- units do all the fighting.
Combat Flow
- Attacker declares -- choose which units attack and which opponent they target (critical for multiplayer/FFA where multiple opponents exist)
- Defender chooses blockers -- assign ready units to block incoming attackers
- Resolve combat -- blocked units deal damage to each other (Might vs Endurance). Unblocked units deal their Might as damage to the targeted player.
- Damage applied -- unblocked damage is dealt to the targeted player's life total.
Keywords in Combat
- Summoning Weakness -- units cannot attack or activate abilities the turn they enter play (core rule, not a keyword)
- Guard / Taunt -- forces attackers to target this unit before the player
- Rush -- the unit is allowed to attack the turn it is played
- Damage dealt to units resets at end of turn