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.
League of Legends Rek'Sai players will find him to be a confusing character to build out properly. You will notice that his build is modified when he is playing against either well-rounded or specialized team comps, showing you should not take the same Rek'Sai build every single round of League of Legends
The most critical items to include in your champion's build are: Stridebreaker, Sterak's Gage, and Edge of Night. Players who added these items in their kits had a greater winrate than players who used other item builds for Rek'Sai. Likewise, if you are fighting a well-mixed enemy team composition, you should strongly consider getting yourself the Domination, and Precision runes. In recent games, he won the greatest percentage of his matches when equipped with these runes.
We established our Rek'Sai build recommendations by analyzing 42,806 recently ranked League of Legends rounds with him in them. We only advise the best winrate Rek'Sai builds that have been built by ranked League players enough times for us to propose them. With so many matches in our data, we are very confident in our provided builds.