Pretty sure summoning a bunch of monsters in one turn is legal without screwing the rules.
http://www.nintendoworldreport.com/news/47286/card-based-rpg-a-long-way-down-dealing-on-switch
An upcoming indie RPG for Switch will require the heart of the cards.
French indie studio Seenapsis have announced A Long Way Down, an isometric RPG with a card based battle system. In the vein of titles like Darkest Dungeon, the game is meant for multiple playthroughs.
No release date has been given for the title.
