Ezreal vs Aphelios

Land Mystic Shot (Q) as often as you can: each hit lowers all your cooldowns and adds a Rising Spell Force (passive) stack.

Detonate Essence Flux (W) with a spell rather than an auto: the orb deals its damage either way, but a spell refunds its mana cost plus a bonus.

Save Arcane Shift (E) to escape unless the kill is certain: it's your only way to reposition, on a 26 to 14 second cooldown.

Cast Trueshot Barrage (R) across the map to finish a fleeing target: it hits everything in its line, but deals less to minions and non-epic monsters.

Back off when he holds Gravitum and has slowed you: Weapon Abilities (Q) with the cannon roots every enemy that weapon has slowed.

If you can engage, go for him when his support drifts away: his kit has no dash, and only Severum makes him run faster.

Spread out from your allies when he has Moonlight Vigil (R): the blast explodes on the first champion hit, damages those nearby, then he attacks each of them.

When he deploys the Crescendum sentry with Weapon Abilities (Q), leave its area: it attacks you with his off-hand weapon.