I'm not sure I understand Adding things to your card pool. "Example: Xianghua's F:"
If I am to add an attack to my card pool:
1) Am I able to attack with it?
2) Do I have to check for it?
Also does (+X) mean I add progressive difficulty to the check "Example: Xianghua's E:"
1) I deal damage of 3 does that mean i have to check 4 since there is 1 attack in my card pool?
2) If I choose to fail the check does my combat phase end?