Hi my name is Hankland, I'm a jungler main and I got the chance to play Rek'Sai on the PBE so I hope most of the info on her I know has remained the same since she went live today as of writing this guide. This is my first guide so let's try to not get all butt-hurt if I suck as much as Pantheons ability to solo dragon as of 4.21.

+Pros
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• Insanely Mobile
• Huge Burst (240% additional AD with max Fury E, WTF)
• No Mana Costs
• True Damage
• Fairly Versatile (can split push, assassinate, be tanky, be hyper ganky, counter jungle, no biggy)
• Amazing Counter Jungler and objective control
• Amazing Farmer
• Decent Ganker
• Can have some amazing surprise Ganks with Ult
• Fun to strategize and pre-plan with her Tunnels

-Cons

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• Super Squishy
• Easily kited
• Only one CC = not a whole much in the ganking potential
• Her Burrow is still fairly noticeable
• Enemy can just step on your tunnels and reduce a lot of your mobility

No MR Runes? Yes. For her counterjungling and clearing build I focus on as much clearing potential as possible. Because next to nothing does Magic Dmg as a neutral creep, CDR and AS runes help clear even faster. Besides I rush an early Hexdrinker and it's all the MR you need while ganking to survive the early game.

You can swap Frenzy if you don't build Crit (but OMG YOU SHOULD).
Alternatively you can go 21/0/9 as seen in my Utilitized Ganker Build.

Passive:Fury of Xer'Sai

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ActivatingBurrow with Fury will grant Fury of the Xer'Sai for 5 seconds, which causes Rek'Sai's next source of Fury generation to grant 15 bonus Fury and, so long as she remains burrowed, to expend 20% of her current Fury every second to restore health. The health restored is based on the amount of Fury expended, for a maximum of (25 × level) health over 5 seconds if she burrowed at 100 Fury.

Fury of the Xer'Sai will not activate if Rek'Sai is at full health and her Fury will stop depleting if she reaches full health.

TL:DR If you burrow you heal and gain additional Fury on your next use of your E or Q but you lose Fury every second by healing yourself.

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Queen's Wrath (Q)

Unburrowed - Active: Rek'Sai's next three basic attacks within 5 seconds deal bonus physical damage to her target and all surrounding enemies.

Physical Damage: 15 / 35 / 55 / 75 / 95 (+ 40% Bonus AD)
Total Damage: 45 / 105 / 165 / 225 / 285 (+ 120% Bonus AD)

Prey Seeker (Q)

Burrowed - Active: Rek'Sai fires a pulse of void-charged earth forward in a line that damages the first enemy hit, dealing magic damage and revealing all enemies within X-range of the target for 2.5 seconds.
Magic Damage: 60 / 90 / 120 / 150 / 180 (+ 100% AP)

TLDR: Press this to enhance the next 3 auto attacks of yours as AOE with more dmg but you only have 5 secs to do so. While burrowed it shoots a laser. Everyone likes lasers. These lasers give vision. As all lasers do. :)

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/Burrow / Unburrow (W)
Unburrowed - Active: Rek'Sai burrows into the ground, reducing her sight radius to X and disabling her basic attacks while gaining: Tremor Sense; 15 / 20 / 25 flat movement speed, the ability to ignore unit collision; and access to an alternate set of basic abilities.

Tremor Sense: Enemy champions and neutral monsters within 1300-units that move within the Fog of War have their position revealed for Rek'Sai and her allies. This does not grant sight.

BURROWED Active: Rek'Sai will burst out of the ground: dealing physical damage and Airborne icon knocking up surrounding enemies for up to 1 second, based on their proximity to Rek'Sai. Enemies cannot be affected again by Unburrow for a few seconds.
Physical Damage: 60 / 110 / 160 / 210 / 260 (+ 50% Bonus AD)

Rek'Sai can attempt to basic attack enemies while burrowed to trigger Unburrow.

TLDR: Press this to start healing and gain more vision, flat movement speed and no more unit collison. Also your Q and E are now different. If you press W again while under people you knock them up (yes even Annie).

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/

Furious Bite / Tunnel (E)

Unburrowed - Active: Rek'Sai bites her target, dealing physical damage that is increased by 1% for every 1% of her current Fury. If Rek'Sai has full Fury, Furious Bite will deal true damage instead.

Minimum Physical Damage: 80 / 90 / 100 / 110 / 120% AD
Maximum/True Damage: 160 / 180 / 200 / 220 / 240% AD

TLDR: While burrowed you can make tunnels. Do so to make it easier to travel later. While unburrowed you do lots of dmg. Almost as much as a Darius/Cho Ult with enough AD. Did I mention it was true dmg while at max fury? #nerfgunready

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Zerg Rush (I mean Void Rush)

Passive: Rek'Sai gains bonus attack speed.

Bonus Attack Speed: 20 / 40 / 60%

Active: Rek'Sai targets one of her Tunnel Entrances and begins channeling. In addition to disabling effects, Void Rush's channel will be interrupted if Rek'Sai takes damage from champions or turrets. Interrupting Void Rush will put the ability on an 8 second cooldown.

If Rek'Sai successfully channels for 1.5 seconds, she will burrow into the ground and rapidly dash to the target tunnel, becoming untargetable until she reaches one of her tunnel entrances. This will not put the target entrance on cooldown.

TLDR: Shen wishes his ult didn't require teammates and just required his ability to use one of his earlier abilities in the game. You go to any of your tunnels, your choice. Its OP.

Will update this with more info but here's some stuff I've noted from the PBE.

Her ult gives Atk Speed. So focus more on AD than AS and you'll be fine late game anyway.
40% CDR makes her ulti have a 48 sec Cooldown. #balance

What I will say here for now is you can choose to counter jungle, gank or farm Rek'Sai depending on how your team is doing and that will choose which machete you buy. If you're ganking try my other two builds.

Need to Test on live some more to see what the meta-counters are.

More on this later too. I KNOW IM AWFUL :<

Standard Combo
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Unburrow Knockup -> Q -> Auto x3 -> E -> Burrow repeat

Ult Combo.
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The best strategy is while applying a gank on your exit put a tunnel in one of the bushes. When you ult, channel to your own tunnel and use the vision of the bush to your advantage. You can retunnel under an opponent and before they notice unburrow and start a surprise Standard Combo. But this time it'll probably be their demise.

Use your ult to secure objectives or apply pressure when needed. Having bush control in lane is as easy as an early sweeper and remembering to buy and use wards constantly.