So... what I'm thinking of doing in SSBB: Cards, and maybe in the RPG too, is to have a stat like "Risk" to represent going into dangerous positions for items, attacks, etc...
You can willingly raise Risk to increase attacks, damage, or defense (temporarily), or to grab an item.
But high Risk makes you easier to attack, and a high enough Risk can leave you out of the ring completely (forcing you to recover or die).
In addition, Risk affects who gets hit by bombs and so on.
Some attacks leave you open or are otherwise risky. These raise Risk either temporarily or permanently.