Arcane Gambit
Chess, but you brought your own deck and the board can be rewritten mid game.
About
Arcane Gambit is a strategy game built where chess and card games overlap. You and your opponent face off across a 5x5 board, each with a king sitting on the back rank, and the goal is exactly what it sounds like: capture the other king. No check, no checkmate, no illegal move warnings. If the king sits where you can take it, you take it. The twist is the deck. Every piece on the board got there because you played a card, and every weird thing that happens to the board (a tile gets dropped in, a tile gets ripped out, a piece slides one space because the wind picked up) came from somewhere in your hand. There are cards that chain enemy pieces in place, cards that destroy them, and cards that flip them to your side. Pieces summon onto your back rank and sit chained for one turn before they're allowed to move, so timing your summons matters as much as where you put them. It's a game about deck identity meeting spatial pressure, where the lines you can play depend entirely on what you brought to the match.