Gondar is a great offlane hero that excels at chasing foes, ganking and making your main carry even richer
Be sure to start ganking as soon as you got track up to max out your team's gold income
Gondar is better played as a solo offlane hero as he needs early levels more than he needs items in order to be effective, as he lacks mana you will often need Drums of Endurance/Medallion of Courage/Vladimir's Offering to really boost your mana regen so you can be effective at ganking.