Ezreal vs Kalista

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.

After a trade, back off until her spears fall out: they stay stuck for 4 seconds, and Rend (E) deals more damage for each extra spear.

Cast your spells as she starts an auto: she can't cancel the animation, and Martial Poise (passive) only makes her hop once the shot is out.

Focus her Oathsworn when you can: without them, Fate's Call (R) has no one to throw, and Sentinel (W) loses its bonus damage.

When Fate's Call (R) pulls in her Oathsworn, spread out: they can launch within 4 seconds, stop at the first champion hit and knock back nearby enemies.