You can fill this deck with draw or removal, and you'll be merrily committing creatures to the board each turn, while expanding your own board state for free
You can kind of see why this is hilarious
Now, lets look closer at the Warhammer Secret Lair stuff
Since the way it triggers would let it go on the stack regardless of whether or not you've satisfied the trigger, you can react to it by blowing something up, which means it's super dangerous, because at that point blowing up Alpharael, Stonechosen won't help
Mystery Booster First, a tiny bit of history: Wizards introduced Mystery Boosters in fall of 2019, with the Convention Edition then followed up with a release of Retail-Exclusive packs in spring of 2020
Generally, I find commanders like this boring as they become good stuff decks, filled with a heap of powerful cards, and lacking a theme