Shyvana vs Master Yi

Hit champions to build Dragon Fury for Dragon's Descent (R): your autos and spells generate it, but less when they also hit minions or monsters.

Engage with Dragon's Descent (R): you become unstoppable, make the enemies you fly over flee, then your spells are empowered.

In dragon form, cast Molten Burst (E) through their group: the fireball pierces enemies and leaves a trail of fire that burns every second.

In dragon form, save the last Emberstrike (Q) recast for your main target: the bite deals true damage.

Against Highlander (R), don't run alone: regroup with your team, because he gains speed and ignores slows.

If you have CC other than a slow, land it right after Alpha Strike (Q): during the strike, he's untargetable, and Highlander (R) ignores slows.

If you have CC, interrupt Meditate (W): he channels it to heal, more at low health, and to reduce the damage he takes.

Put pressure on his jungle early on: Master Yi is strongest once he has his items, and each stolen camp delays him.