5Clash Royale card guide
Bowler rolls boulders that deal splash damage in a straight line and knock troops back. He's a strong defense against ground swarms and tanks.
Use Bowler against ground pushes; his boulders clear swarms and push troops back. On offense he breaks up the defense from behind a tank (Golem, Electro Giant). He also makes ground defense easier in Balloon decks.
Cards that deal with it efficiently:

This card has a hero form. The hero is active in your deck’s 2nd (Hero) or 3rd (Wild) slot. The Hero slot unlocks at Arena 5.
ElixirDeck automatically takes your unlocked evolutions and heroes into account: build your decks.