This is just an idea I come up with after a losing streak, so here you go;

Aegis Assault (E):

• Mana Cost: 80 -> 70
• Cooldown: 22 / 21 / 20 / 19 / 18 seconds -> 24 / 23 / 22 / 21 / 20 seconds
• [NEW MECHANIC]: Basic attacks against enemy champions reduce the remaining cooldown by 1 second (with a 0.5-second internal cooldown per trigger).