We currently don't know exactly in what way, given how new the game is, so there's no precise precedent
It doesn't use the stack, it's not a spell, it can't be responded to, it has no mana cost, and it counts as your land play for the turn
I was worried that Adventures in the Forgotten Realms would be designed primarily to attract D&D players to Magic (or vice versa) rather than be something non-D&D players would love
You'll usually get a counter of this the turn it comes down, and it will start to snowball as you buff creatures and make them into Mutants
Hangarback Walker and Secure the Wastes are also nice ways to get a large number of bodies for either the Cutthroat or the Abbey
While many white decks are creature-focused, not all white decks play to the board enough to worry about protecting their entire team