The Musketeer has a high damage output, but relatively few hitpoints.
She has purple combed hair, a musket, and a metal helmet with a tiny crater on it.
The Musketeer can be used to back up higher hitpoint troops such as Giants. In fact, this is a deadly push as overlooking it can cause the player a three-crown loss. Note that this can easily be countered with a Skeleton Army or another swarm card.
As the Musketeer can target both air and ground troops, she is a powerful substitute to Archers, albeit at the price of a higher Elixir cost.
Her long range allows the Musketeer to help attack from a distance without engaging the defending troops.
Musketeers are extremely effective against Balloons, as their slow movement speed enables her to land enough shots to destroy them before they reach a Crown Tower, assuming she is deployed before the Balloon crosses the bridge.
A very powerful combo is the Hog Rider, the Musketeer, and the Valkyrie. The Musketeer is for protecting the Valkyrie and Hog Rider from air troops. The Valkyrie is for protecting the Musketeer and Hog Rider from mass troops (i.e. Skeleton Army, Spear Goblins) and the Hog Rider is used to tank for the Musketeer and Valkyrie.
This strategy is commonly called the Trifecta for its combination of three troops.
Never ignore a Musketeer that is locked onto a tower. Doing so will cause the player to significant damage, numbering in the hundreds, depending on how much health the Musketeer has left.
If the player needs to pressure the other lane with the Musketeer, but also needs to stop an assault on a building and only has a Musketeer to counter, she has the range to do so; place her in the opposite lane in the middle and at the very back, behind the King's Tower. This will only work if the building is beside the King's Tower.
If the player opens the lane, planting her in the 2nd tile from the river will allow her to target the Arena Tower without getting targeted by the King's Tower. Placing her on the 3rd tile from the river will allow her to target the Arena Tower but has a very high chance to be targeted by the King's Tower.
Pairing her with the Ice Spirit can take down a Mini P.E.K.K.A. + Fire Spirits combo. The Ice Spirit takes out the Fire Spirits and the Musketeer finishes off the Mini P.E.K.K.A.
The Musketeer card was released with Clash Royale's soft launch on 4/1/16.