Reaching the end of the dungeon means a player has "completed" it, which is important for certain cards
For removal, Prison Realm works well and keeps the tempo going with its scry ability, along with Kraul Harpooner for those pesky flyers
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Happy Meal also include a mini picture frame, deck box, or sticker sheets
We paid particular attention to the process of selecting the booster pack, opening it, and looking at the cards so that it would feel fun." The reluctance to explicitly confirm that pack choice does make a difference suggests it doesn't, and others have theorized this is the case too
They essentially serve as mini-quests, eerily similar to those offered in Hearthstones Battlegrounds mode