Gain 5 Magic Resist. Whenever you heal for at least 20 health or from a consumable's effect, increase your Magic Resist by 5% for 3 seconds.
Fleet Footwork provides both great lane sustain as well as well as the movement speed needed to position for follow-up damage.
WhyPresence of Mind
Presence of Mind on Corki allows you to take massive trades and all-ins thankto being able to spam [R] after leveling in lane or picking up an assist in a teamfight.
More Attack Speed means more damage,. Corki's unique passive means that the more he is able to auto the harder it is to itemize against him thanks to his split damage.
WhyCoup De Grace
Corki can be one of the burstiest champions in the game thanks to his strong Sheen procs. Coup De Grace lets empower that burst even further on squishy targets.
Revitalize pairs well with Fleet Footwork allowing you to take repeated lane trades to wear down your opponent while being able to stay healthy yourself.
The early game Magic Resist of Mirror shell further empowers your Fleet Footwork and Revitalize healing. For every point of health that you heal from those, the MR from Mirror Shell is even more valuable, making you a deadly lane opponent.