Briar vs Rammus

Cast Blood Frenzy (W) only when you want to end the fight: you charge the nearest enemy, champions first, without choosing your target.

Save Snack Attack (W) for when you're low: your next auto deals damage based on the target's missing health and heals you for part of it.

Fully charge Chilling Scream (E) near a wall: the scream then knocks enemies back, and those who hit the wall are stunned.

Cast Certain Death (R) across the map to engage or catch a target: you fly to the first champion hit and chase them until they die.

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.