This build works in most games.

Pros:
Mind-blowing aoe mana burn and crowd control!
Extremely high movement speed
Great self heal over time
Great scout/ganker in mid game.
Ridiculously long tornado
Very flexible playstyle late game

Cons:
Low damage per swing
Requires many levels to be effective
Long cooldowns on spells
Not proficient at controlling runes
Low MS early game

With orchid, Invoker can kill most heroes 1v1 mid game; focus on enemy carry. Do not let them farm.
Ghost walk/ice wall can be used to initiate team fights too, not just tornado/emp.

Refresher combos is only for veteran invoker players/players that can use it well, otherwise skip it

6.88 Groov's Personal Q/W build, This is my personal builds, u can modify it to what ever u think its suitable for your playstyle, anything that included in the guide is not the only way to play this build.