The pack has always dealt from the whole warehouse. From today you can point it at the one coin you actually trade — and it stays pointed.
If you only trade one market, a random four was a coin-flip against you — roughly one card in four was yours. Now the sealed pack carries a row of chips: ALL · BTC · ETH · SOL · XRP. Leave it on ALL and nothing changes; pick a coin and all four cards come from it, the Rare-or-better guarantee included. Your free daily pick works exactly the same either way.
The reroll dialog carries the same chips, so every throw is a fresh choice — BTC this roll, ETH the next, at the usual reroll price and nothing extra for switching. The Pack remembers your last pick, so tomorrow's free pack arrives already pointed at your coin. And if a coin's shelf happens to be thin that day, the pack says so before a single credit moves.