Elise vs Rammus

Start in human form with Cocoon (E) then Neurotoxin (Q), strong on a high-health target. Finish in spider form with Venomous Bite (Q), strong on a low-health target.

In spider form, save Rappel (E) to finish or to escape: landing on your target empowers Spider Queen (passive), and Rappel's long cooldown leaves you vulnerable afterward.

In spider form, cast Skittering Frenzy (W) once you're on your target: you and your spiderlings gain attack speed, and they attack the target you bite.

Gank early and often: Cocoon (E) stuns the first enemy hit from range, and Elise is strongest before everyone has their items.

Stay behind your minions: Powerball (Q) stops on the first enemy it collides with, minions included.

If you deal magic damage, lean on it in trades when Defensive Ball Curl (W) is on cooldown: without it, his resistances drop to those of an ordinary tank.

If you're ranged, don't let him reach melee range when Frenzying Taunt (E) is ready: its range is short, and it forces you to attack him.

Get out of the Soaring Slam (R) area fast: aftershocks repeat the slow there, and if cast during Powerball (Q), it adds a knock-up in the center.

Don't attack during Defensive Ball Curl (W): each auto returns magic damage to you, and he gains armor and magic resist.