Card Mechanics: Hand Management to Deckbuilding

Hidden information token, randomizer (shaped probability distribution), and rules container (unique text).

Mechanics where the key decision is which card to play now versus hold, made interesting by costs beyond the card itself.

Multi-use cards, hand-size limits, and forced sequencing (no reordering).

If a player would happily play their whole hand immediately, it's a to-do list — add a constraint (one card per turn, a cost, a combo requirement).

Hidden information and controlling *when* you win tricks (Hearts, Spades, The Crew).

Combinatorics — shaping your hand into playable combinations (Tichu, The Great Dalmuti).

Value exists only in the aggregate, making drafting and denial meaningful (Rummy, Ticket to Ride).

Draw 5 from your deck → spend for actions/buying power → discard all played and drawn → reshuffle discard when deck runs out.

Because the whole deck cycles, anything added is guaranteed to come around again — permanently.

Adding weak cards lowers the ratio of good cards so strong ones appear less often; trashing/culling mechanics remove junk.

P = 1 − C(N−k, h)/C(N, h), where N = deck size, k = copies wanted, h = hand size.

50% (1 − 126/252); two copies raises it to about 78%.