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You may choose from regular travel rewards credit cards that will allow you to redeem miles with any airline, including Wow Air. Such cards are not tied to one particular airline. In fact, they are not connected with any airline and miles you will earn are close to cash back rewards redeemable for travel and flights in particular. And since Wow Air does not offer airline credit card, a travel rewards credit card can be the best option for you.
Take a look at the Discover it® Miles credit card, for instance. It's a perfect option both for avid travelers and regular people. You get unlimited 1.5x miles on all purchases, which are matched at the end of the first year (provided you are a new cardmember). That's basically as much as 3 miles per dollar, it's more than some premium cards give you on purchases and more than all airlines give on airline purchases. Simply, that's a lot.
Discover is applicable to all airlines and not only them - there are numerous opportunities to redeem your miles. What's more, with Discover you are sure you don't overpay - there's no annual fee ever, there's also no foreign transactions fee, which allows you to save your money while traveling abroad.