Well how the card works isnt explained yet. Only that it can make that person into an "angel". Since they were talking about possible Rating Game between "Evil=Piece" and "Brave-Saints", it might be further explained.
Personally rather than normal battles, I prefer the Rating Game match. So volume 2, 5 and 10 is good. But since Rias is still underage she wont be able to participate in a official match.
@lilNewBlood
Actually Ise gets a Triaina in volume 9. But in volume 8 last story, Ise meets Beelzebub who alters/fixes the chess piece inside Ise. But like you said that story only is a story which is created for volume 8 and an event which happens after volume 7.
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