I've already been using it to great effect in constructed. Only played around 3 hours total but I'm at rank 10 already. Hoping to make legend this month...We'll see how much time I can put into Hearth.
Some better uses that I've come across already:
1) Feigned Slyvannas to steal a Sludge Belcher in one occasion, stole an enemy Highmane in another.
2) Feigned Webspinner, Loot Hoarder, and Haunted Creeper all at once for (excellent) card draw and solid early board control (Hunter's Mark x2 helps)
3) Feigned Explosive Sheep on multiple occasions for board wipe. This has been one of the best additions to my control deck so far. Zoo was stomping me early on, but this definitely helps. A lot. Much more effective than Explosive Trap, albeit two more mana and one more card. Still, you get to control exactly when it happens, which is a plus.
4) Feigned single Highmane for two 2/2s that were used to hit face while the opponent dealt with the Highmane itself. Brought down their HP to 15 before they were removed, after which point I was able to Kill Command face and win with hero power a couple turns later.
5) Feigned Malorne! LOL! Never drew him again that game but I thought that was interesting to say the least.
Are you running 2x Feign Deaths and do you feel like both are necessary? And are you getting value out of Steamwheedle Sniper? Was watching Nox play Control Hunter and he struggled to find uses for the Sniper.