Use Rek'Sai's mobility to your advantage; hop from lane to lane ganking the enemy and helping your allies. Use the time in between to jungle.
Tunnel is excellent to close the gap on enemies when chasing but if you overextend, it could put you in a bad position to get picked off.
LoL Rek'Sai players may find him to be a complex champion to build out properly. You'll find that his build is modified when he is fighting either well-rounded or homogenous team comps, indicating you shouldn't select the same Rek'Sai build every round of League of Legends
The most critical items to use in your champ's build are: Stridebreaker, Guardian Angel, and Edge of Night. Those who included these pieces in their kits had a higher winrate than those who worked towards other Rek'Sai builds. Moreover, if you are facing a well-mixed enemy team arrangement, you should strongly consider getting him the Precision, and Inspiration runes. In recent games, he won the largest fraction of his rounds when using these runes.
We calculated our Rek'Sai build recommendations by examining 31,146 recently ranked League rounds with him in them. We only recommend the top winrate Rek'Sai builds that were used by ranked gamers enough times for us to reccomend them. With so many matches in our dataset, we are quite confident in our suggested builds.