From the Super Mario Wiki
PMCS Self-conscious.png
“Mario's feeling self-conscious. He can only use pre-painted cards.”
Battle text, Paper Mario: Color Splash

Self-conscious is a status effect in Paper Mario: Color Splash, inflicted only by orange paint in the battle with Roy. While Mario is in this state, he can only use fully painted cards. Like all other status effects exclusive to said battle, the effect is temporary and only lasts one turn.