Natural Defenders

This fight is quite RNG, as Runehoof seems to change the timing on the stun move. However this combo worked for me most times.

Kun Lai Runt (mine is P/S) 1,1,1
Iron Starlette (mine is P/S) 1,1,1
Nexus Whelpling (mine is (P/P) x,2,2

Start with Kun Lai Runt

(1) Thrash
(2) Pass
(3) Rampage
Slugger Dies
(4) Change to Iron Starlette for first hit
(5) Change to Kun Lai Runt to eat the stun. Kun Lai Runt dies. Bring in Iron Starlette.
(6) Wind-Up (If you get stunned, that is Runehoof RNG, and you'll need to restart).
(7) Supercharge
(8) Wind-Up
Runehoof dies
(9) Powerball until Iron Starlette dies. Bring in Nexus Whelping
(10) Arcane Storm
(11) Mana Surge for the win!

I know there's plenty of other strategies listed here, but I got this one from @Lhumen.
Never fails even with bad RNG.

[npc=36871]
[pet-ability=202], [pet-ability=362], [pet-ability=159] (2,1,2)

[npc=77221]
[pet-ability=459], [pet-ability=566], [pet-ability=208] (1, 1, 1)

[npc=68845]
N/A, [pet-ability=489], [pet-ability=589] (N/A, 2, 2)

1. 
   
2. [pet-ability=362]
3. 
   
4. [pet-ability=159] (Slugger will die here or the next step)
5. 
   
6. [pet-ability=202] (until Core Hound Pup dies)
7. 
   
8. [pet-ability=459] (just cast again if you get stunned)
9. 
   
10. [pet-ability=208] (just cast again if you get stunned)
11. 
    
12. [pet-ability=459] (Runehoof will die here or the next step)
13. 
    
14. [pet-ability=566] (until Iron Starlette dies)
15. 
    
16. [pet-ability=589]
17. 
    
18. [pet-ability=489]
19. 
    

Getting that daily done strategy: Use all level 1 pets. Beast, Mechanical, Magic with abilities that match their type.