Ezreal vs Aurelion Sol

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.

Stay behind your minions: Breath of Light (Q) hits the first enemy in its path, and only the seconds spent on a champion give him Stardust.

Play hard early and don't let the game drag on: with Cosmic Creator (passive), each of Aurelion Sol's abilities grows permanently stronger through Stardust.

Leave Singularity (E) quickly: it pulls you toward its center, where it executes enemies below a health threshold, and each second inside gives him Stardust.