Function parse_static_ability 

pub fn parse_static_ability(raw: &str) -> Option<StaticAbility>

Parse a raw S$ (or S:) ability line from a card script into a StaticAbility.

Returns None if the line does not start with the S$ / S: prefix or has no recognisable Mode$ param.

Format

S$ Mode$ Continuous | Affected$ Creature.YouControl | AddPower$ 1 | AddToughness$ 1
S$ Mode$ ETBTapped | Description$ Enters tapped.

Reference: Java StaticAbility.java in forge/game/staticability/.