* { display: block; }
power, challenge, advantage { display: table-row; }
power > *, challenge > *, advantage > * { display: table-cell; }

option, rule { display: list-item; }
option { list-style-type: circle; }

label { font-size: 200%; margin-top: 1ex; }

power > * { border-bottom: 1px solid black; }

*[source=MURPG] { color: blue; }
*[source="X-Men"] { color: red; }