Rell, in my opinion, is one of the best all-game divers in the current roster. With a wide engage on her 'W', Rell can catch an off-guard duo bot lane in a deadly cc chain that any ADC with decent damage can clean up in an instant. The trick with playing Rell, dive, dive, dive! As long as you aren't losing minion wave (and sometimes even if you are) you can dive an enemy bot duo, and provide your ADC with the opportunity to get countless easy double kils.

The one catch to playing Rell is if your ADC plays cautiously. A Rell left to sit behind wave and wait for their ADC to farm will easily get poked down and be forced to back frequently. If your ADC falls under this category, you will have to pray your Jungler is thirsty for some bot-lane ganks, or roam as soon as possible.

I love Rell because she can build tanky in many different ways! You can build armor if the enemies are primarily AD, build MR is the enemies are AP, build ally-protection if your ADC keeps dying, you can really build any tank/support item there is! I have listed my personal favourites for each scenario in the item list, but I believe the trick to succeeding on ANY champion is through playing as them, experiencing their playstyle, and adapting it to your own.

Over time, how you play Rell will change, as you and her become one, and eventuall you will be trapped in League of Legends and forever carry your future ADCs to victory and eternal glory! Huzzah!