Happy Hour: gragas's passive gives him health back when he uses an ability which if u have blue buff u can just spam your w and regain health

Barrel roll: this is your main source of dmg if your AP but your ad so your just going to use it for slows.

Drunken Rage: This is your main source of dmg You'll be using this to do most of your dmg to the enemy team

Body slam: this does alot of dmg with AD but it more used with cc and mobilty

Explosive cast: this ability is a cc based abilites for this build, as it runs on AP

E,Flash: this is a good surprise cc combo that makes ganking easy as you can use this when your target is surrounded by minions. First this is that you have to e in a direction. after your E is coming to an end u flash and your body slam will carry in with the flash. you can flash in any direct and it will carry the same purpose

E,R: there is two different ways you can do this. 1st is the e into the target and ulting the apposite way u want you want them to go. doing this will stun the enemy making it easy to land your ult.
2nd is to ult before you land your E making it so it is going to ult just after you E,

HINT: if you didn't know your ult has a 0,5 second delay before it ults making it harder to hit, thats why you really don't want to ult without cc