Blizzard Entertainment will air a new commercial for Hearthstone: Heroes of Warcraft this week on primetime TV. The spot, a funny video called “Substitution,” will show up during the NHL and NBA finals.

You can watch the ad right now through the video below.

The NHL finals between the Chicago Blackhawks and the Tampa Bay Lightning begin tonight, while the NBA finals, pitting the Golden State Warriors against the Cleveland Cavaliers, tips off tomorrow evening.

Hearthstone recently reached 30 million players. For more on Hearthstone, check out all 31 cards featured in the new Blackrock Mountain expansion.