Gangplank vs Gwen

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.

To hit her during Hallowed Mist (W), walk into the mist or wait for it to fade: from outside, you can't target her.

Take short trades before she lands 4 autos: each one adds a snip to Snip Snip! (Q).

Step out of the Needlework (R) line: she can recast it twice within 6 seconds, with three then five needles.

Answer her split push with two players rather than alone: A Thousand Cuts (passive) heals her on every auto against a champion.