From the introduction:
This system is an interesting and simple game mechanic replacement for dice rolls in a role-playing game by employing card games.
These modifications may be added to other card games, but do not otherwise alter the rules anymore than is required. Igria allows players to “petition” the game master for and get a type of card, or trade cards among themselves, depending on the power of a player character. Experience points come from the cards actually played and it is possible to wager petitions, cards, XP, HP, game styles, game locations and so on.
A genre-neutral methodology for building and improving characters with a heavy focus on using card resolution mechanics in favor of dice. The system assumes the use of a setting, etc., from another source.