Gangplank vs Malphite

Build a chain with Powder Keg (E): detonate the keg farthest from your opponent, and each keg whose area touches the previous one explodes too, all the way to them.

Last-hit minions and pop kegs with Parrrley (Q): a kill with the shot gives bonus gold, and so does a kill from a keg it sets off.

Save Remove Scurvy (W) for a key CC rather than for healing: it cleanses all CC on you, on a 22 to 14 second cooldown.

Cast Cannon Barrage (R) anywhere on the map to help a fight or cover an objective: each wave of cannonballs slows and damages in the area.

Break Granite Shield (passive) with a cheap hit before taking a real trade: it absorbs 10% of his max health and triples his bonus armor.

If you deal magic damage, lean on it in trades: his only resistances come from Thunderclap (W), which only gives armor.

Trade when his mana runs low: Seismic Shard (Q) costs 70 to 90 mana, and it's his only ranged slow.

Once he hits level 6, only step up if he's visible: Unstoppable Force (R) comes from far away, nothing stops it, and its impact knocks every enemy in the area into the air.

When he has Unstoppable Force (R), spread out from your allies in teamfights: the impact knocks every enemy in the area into the air.