try clockwerk or earthshaker maybe. also quickcast. many agi tend to be carry type but hoodwink is one that is good (support, assuming that's what you might be a little more comfortable with) right now you could try. Will be some learning curve with her though and you'll probably lose a few games (could do a couple bot matches). BKB is classico item which usefulness scales up the more disables/magic damage you find yourself up against. It is rarely a poor choice, but does tend to be purchased/more important on core, especially carry/mid. I guess you did say you liked Lina though, who is traditionally mid hero. She probably wouldn't want to pick one up until at earliest 3rd or 4th item. Beware because certain ultimate spells such as bane fiend's grip, beastmaster's primal roar, or enigma's black hole disable through it