Hearts Premium is the game’s subscription option, which disables advertisements and unlocks other benefits.
Benefits of the Hearts subscription:
Remove Ads — Suppresses all interstitials and banner ads
Bonus XP — Provides an additional 50 XP per win
Luxury Themes — Provides additional backgrounds and card backs
Subscriber Goals — Provides a 4th Goal for additional XP
Premium Avatars — Provides additional avatar customization options
Premium Emotes — Provides additional emote customization options