Greymane is a Squishy Assasine with high damage. But 80% of the Time he needs a Melee close to him. Be sure you dive in with E when "no one cares" about you and also be quick to fall back ... So also the build depends on the TeamCombi .... just figured out that AutoAttack Human BUild does not enough Damage compared to CocktailHybrid!!!

Rotation til LVL 15 (Starting as human) : Q/E -> Worg: Q/W/Q/E -> Human: Q + Autoattack/Rotate again

At LVL 16 its is the "same" rotation but Start with W to get 80% Bonus of the Cocktail.

Use the Ultimate when you chase a Enemy or when some enemy is low on life.

Tier 1: With a Good Team and enogh melees Wolfheart the prolonging is pretty nice. For more safety and enough Mana at the earlygame + Higher Range for chasing/staying , most importent is the 60 Mana take Perfect Aim

Tier 2: Thick Skin helps you to dive in and to survive ich you cant avoid 1 on 1 (if you hardly need Mana you can skill Insatiable but in late game not needed anymore) / the invisibility is just an option if you realy need to escape hard all the time

Tier 3: Extrem good skill to hit Hidden Nova/Zeratul and always deal damage even if you miss targets

Ultimate: extrem Usefull to dive on low life Chars and Healers

Tier 4: Movementspeed is always nice

Tier 5: Clears a lane instant and deals extrem Damage in Teamfights

Tier 6: here you can take another jump or splashing autoattack it depens on the team completely

Tier 7: Later there will be a lot of Teamfights and the Splash (Range or Melee) is pretty awesome there