Exploding Kittens meets DanDân. Two players share one deck of paired cards and one graveyard. Flip the Omen, hunt its twin, and end your turn holding only that card to arm it — then hold onto it through the Sweat.
Every edition plays the same core game. Only the temperament changes.
One 72-card spell deck — 36 cards, exactly two copies of each — shared by both players, with a single shared graveyard. No lands in the deck; every draw is live.
At setup, flip the top card face-up into the middle of the table. That card is the Omen — its other copy, the twin, is the only card that can win the game.
At the beginning of your end step, if you have exactly one card in hand, reveal it. If it isn't the twin, you lose the game. If it is the twin, it becomes armed. While the twin is armed, the only way its owner can lose is an opponent forcing the twin out of their hand: if an opponent's spell or ability causes the owner to discard the twin or exile it from their hand, that player loses the game. It doesn't matter how many other cards are in the owner's hand — added cards are just collateral; they never defuse it. If the owner casts the twin or discards it themselves, the win simply doesn't happen and no one loses. If the owner still holds the twin at the beginning of the opponent's end step, that player wins the game.
Once per turn in your main phase, discard a card to take a land from the Land Pool. The pool never refills — and your discard feeds the shared graveyard your opponent recurs from.