Ezreal vs LeBlanc

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.

As soon as Ethereal Chains (E) tethers you, move away from her: if you stay chained for 1.5 seconds, you're rooted and take extra damage.

Trade while Distortion (W) is on cooldown: it's her dash both to get in and to get out, and it comes back in 15 to 10 seconds.

If you have a shield or a heal, save it for her combo: Sigil of Malice (Q) detonates as soon as another spell hits you, and all her damage lands at once.

If you have CC, aim at the starting point of her Distortion (W): within 4 seconds, she can return there by recasting the spell.

When she drops below 40% health, find the real LeBlanc before hitting: Mirror Image (passive) makes her invisible for 1 second and leaves a copy that deals no damage.