Rek'Lane is a more appropriate name.

Heals, nice damage even while tanky, mobility, CC/vision for ganks, great ranged attack, true damage and no need to buy wards.

Rek'lane is so OP even as a support i was able to hold off both Kalista and Azir after our Draven raged for giving first blood. After the laning phase just went with the old school tank and spank made enemy Rek'Sai jungle rage and forced enemy to surrender a Baron and 4 dragons later.

I didn't even need boots. Tunnels, tunnels everywhere. If you establish map control Rek'Sai becomes the enemies biggest fear. She could be at base and in a fight within seconds and that's with out her ult. Which is pretty useless at all phases of the game. Used it once that entire game and I did it to get to Baron to help Aatrox who got out live without my help.

Rek'lane. Try her if you're on the PBE watch her on YouTube and see nerfs right before your eyes.