Graves vs Gragas

Position with no minion between you and your target: each New Destiny (passive) auto fires 4 bullets that can't pass through units.

Cast Smoke Screen (W) on their carries: inside the smoke, they're slowed and can't see anything outside it for 4 seconds.

Fire Collateral Damage (R) with your back to the danger: the shot knocks you backward, enough to reposition while dealing damage.

Cast Quickdraw (E) often during your clear: it reloads a shell, gives armor and magic resist, and each bullet that hits lowers its cooldown.

Stay behind your minions: Body Slam (E) stops on the first enemy it meets, minions included.

Get out of the Barrel Roll (Q) area right away: the longer the barrel sits on the ground, the more its explosion hurts and slows.

Step up when Body Slam (E) hits nobody: its cooldown isn't reduced and stays at 14 to 12 seconds.

Spread out from your allies: Explosive Cask (R) knocks every enemy away from the impact, which can split you up or send you toward his team.