Observer and sentry wards with custom animations or styles can give an unfair benefit to the player. Here is why.
In Dota 2, multiple skins and custom animations are introduced with each battle pass and new treasure chest. They are purely cosmetic, but sometimes they can accidentally affect also the gameplay.
Reddit user MidSolo discovered it while observing a match with a Broodmother in the mid lane:
Broodmother was surely using the Shifty Minnow skin on his wards, a Mythical item obtainable through The International 2017 battle pass. The following video displays the placement animation.
Moreover, a lv 36 battle pass will also unlock the blue style, which makes the observer extremely similar to the sentry - at first glance it could confuse the opponent.
Header Image: Dota 2 Sets