Stormraider's Surge rework idea

so this mastery isn't very used so i think it a time to rework this mastery to make it more for assassins and mages and marksman then tanks like nasus so her is the rework!

Dealing 30% of a champion's maximum health within 2.5 seconds grants you 40% bonus movement speed and 75% Slow Resist for 3 seconds. remove

new effect dealing 100-700(base on lvl +50 per lvl) (+300% AD) (+250% AP) damage to enemy champion within 2 seconds or gatting in a HARD CC
grants you 200% of your **total moment speed ** for 2 seconds that decays over time , and 90% Tenacity for 0.75 seconds.(30-12 seconds cooldown) (killing an enemy champion reduse the coodown by 45% seconds.)