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Thrasios, Triton Hero, one of Magic's best merfolk, is a potentially powerful partner to give you access to the best landfall enablers and the best effects to pay you off for having so many Rocks

That's not part of the mechanic itself, just something flavorfully tied to permanents it appears on

Make your deck and save it, then you are ready to duel

Isolde, Two Tales of the Noble Knights effect, send Infernoble Arms Durendal from deck to graveyard as cost, Special Summon Infernoble Knight Renaud from deck

Once you purchased the program, all the cards were free you simply "marked" the cards you had in your paper collection and used those to build decks and even play games (although it is unclear exactly how gameplay worked)