Cardaire: Eternal Aces puts the booster pack back inside the game

You play Mulligan, in a world that runs on the power of trading cards. The verbs are collect, craft and duel, in that order and on that loop: explore the map and hunt down specific cards, buy booster packs and crack them, then take the pile you have ended up with into a deck editor and turn it into something that can beat the duelist standing in your way. There are rivals, there are bosses, there are over 200 cards planned, and there is some fishing.

The unusual part is where the pack sits. In almost every digital collectible card game, acquiring cards happens in a shop — a separate screen, a separate currency, and a design job that is mostly about friction. Cardaire attaches acquisition to the world instead. A pack is bought with money the RPG gave you for doing something, which makes opening it a beat in the adventure rather than an interruption of it. The store page is blunt about the corollary: no microtransactions. Once nobody can buy their way past the collection, the collection has to be paced like content, because that is what it now is.

Single-player is the other decision doing quiet work. A card game without an opposing human is a card game where every fight is authored, so the deck is not being tuned against a shifting field — it is being tuned against a specific person with a specific gimmick that you have already lost to once. That is much closer to a Zelda dungeon than to a ladder climb, and it is the reason the genre works as an RPG at all.

The supporting kit is the kind a solo developer builds after playing a lot of these: multiple deck slots, deck lists you can export and import, and a duel UI the developer promises runs smoothly. That last one sounds like a nicety and is not. A card game is a sequence of animations between decisions, and if the animations are slow the whole game is slow.

The two types of randomness in game design is the essay this game is built on top of, whether or not it knows it. The argument is that luck feels like variety when the dice fall before you decide and like a swindle when they fall after. A collectible card RPG runs both at once. The pack is the good kind — it lands before anything is committed, and everything you do afterwards is a response to it, which is exactly why cracking one is fun. The draw is the other kind, and it decides duels after you have already made your choices. The games that survive this put the drama in the pack and give the duel enough consistency tools that a loss can be explained.

How game designers protect players from themselves points at the sharper risk, because the promised fantasy and the failure mode are the same thing. The developer describes the goal as slowly becoming an absolute menace with a deck full of overpowered cards — and the essay’s whole point is that a safe, reliable route to victory is one players will take even when it deletes the game. Exportable deck lists guarantee the solved list exists publicly on week one. The job is not to nerf the menace fantasy; it is to make sure the boss after the menace still asks a question the solved deck cannot answer.

How to keep players engaged (without being evil) covers what happens next. Pack opening is the single most heavily monetised mechanic in the industry, and pulling the payment out of it also pulls out the machinery — the near-miss, the timer, the guaranteed rare on the tenth try. What is left has to hold attention on rhythm, curiosity, visible progress and a fair curve, which is the honest version and the harder one. The fishing is probably part of that answer rather than a joke: somewhere to be when you do not want to be duelling.

Cardaire: Eternal Aces is made and self-published by [aeiou](https://drive.google.com/drive/folders/1ELqkI-WvosrlZnsctwd1rv393aCjjW6E?usp=sharing), a solo developer, and is listed as coming in Q4 2026 to Windows and Mac. Steam files it under RPG, which for a card game is the more interesting of the two labels it could have picked. It is single-player, with Steam achievements, full controller support including DualShock and DualSense, custom volume controls, and save anytime.

The store also lists it as playable without timed input, and on a duelling game that is a real piece of information rather than a checkbox. It means the pressure in a duel comes from the board and not from a clock, which is the difference between a game you can think in and a game that punishes you for reading a card.

Two hundred cards is the number that decides this, and it is a solo developer’s number. Not because it is too many to draw, but because each one has to be worth finding — a card nobody would ever build around is a slot in the collection doing nothing. If the appeal is a collection where the individual items are genuinely distinct rather than wallpaper, Retro Rewind is the other one on this list with the same problem to solve: a shelf of thousands of VHS tapes that each carry a real title and a real genre, because a collection game dies the moment the stock stops being real.