Gangplank vs Riven

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.

Take a trade once she has used Broken Wings (Q) and Valor (E): those are her dashes, on cooldowns of 13 seconds and 10 to 6 seconds.

Once she hits level 6, back earlier: the Wind Slash of Blade of the Exile (R) deals more damage to enemies missing health.

If you have CC or a silence, use it during her combo: all her mobility comes from her spells.