new york, United States
21 years old
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Depending on what cards you got, it's important to have a troop that's good at clearing out multiple troops, fast. Perhaps the best card for this is Valkyrie, which is the perfect troop for countering against the Skeleton Army or other low-hitpoint troops. Simply drop her right in the middle of the action and she'll clear things out quick. Bomber can also be used as an effective counter, but you'll want to spawn him a bit away from the action due to his low-hitpoint. The Wizard can also be a useful counter troop, as his splash damage is effective against multiple troops. Skeleton Army can also be a good card to have for countering against Giants and the like, but keep in mind that Arrows, Fireball or a Valkyrie could easily clear them out.
This strategy gives you two extra card slots for cards of your choice, which could be a faster or hard-hitting troop, such as a Prince, Mini P.E.K.K.A, Dark Prince or Hog Rider, or another card that falls under the categories above. It's entirely dependant on whatever strategy you want to try out, or which cards you prefer to play with.