I see many wrong comments, so here's what worked for me (Horde only).
HORDE ONLY:
- Talk to Alyx to get starter quest (The Final Toy)
- Talk to Maru to get this quest (The Toy Thief)
- Tell Maru the dog did it (25%, time to leave)
- Take portal to Dazar'alor, get the sketch at /way 56.99 22.23
- (Go back to Orgrimmar) Take portal to Valdrakken, fly SW to Ohn'arian Plains
- Talk to Getseng in Ohn'arian Plains at /way 58.56 39.63
- Fly up the mountain and find a chew toy at /way 57.83 31.73
- Fly almost 2km to interact with a toy box at /way 39.66 58.28
- Get to the cave that's close and Maru's toy will be inside. cave entrance at /way 38.35 55.24
- Get back to Maru at the Caverns of Time to gg quest