Its sacrifice ability costs two mana, which significantly limits how much you can use it if you also want to cast spells in the same turn
You can think of cards like Thief of Blood and Mikaeus, the Lunarch as counter movers, but thats not actually what those cards are doing in the context of the rules
Brawl Not Legal Vintage Legal Timeless Not Legal Commander Legal Pauper Not Legal Oathbreaker Legal Penny Not Legal Toolbox Notes and Rules Information for Let the Galaxy Burn: A spell's mana value is determined only by its mana cost
III Put all creature cards exiled with this enchantment onto the battlefield face down under your control
Anything that removes abilities from creatures will remove ward as well
So, it grouped Cleric, Rogues, Warriors, and Wizards together