Technically, this is a hurdle to overcome, but since blocking Disguised creatures is always a risk, its definitely doable
You know that moment when you have a simple custom card idea, and five minutes later youre writing rules text that would make a judge request PTO
If one of the target creatures you control is an illegal target as Graceful Takedown resolves (perhaps because it's no longer enchanted or is no longer on the battlefield), the remaining legal target creatures you control will still deal damage equal to their power
The Penalty Guidelines are your friend when applying penalties
1 Borderless scene card, any rarity Here, you can get one of the scene cards from each of the seven different possible scenes
Commander is a much slower format by comparison, so Mental Misstep is far less powerful there