Games like Hearthstone: The Boomsday Project

If you finished Hearthstone: The Boomsday Project, the closest matches are Legends of Runeterra, D&D Lords of Waterdeep, Spellweaver, Magic: The Gathering - Duels of the Planeswalkers and Shardbound. All 6 share its strategy genre and are ranked by how closely their themes and modes overlap.