If Redcap Gutter-Dweller leaves the battlefield after its last ability has triggered, you can still sacrifice a creature and exile the top card of your library, even though you won't put a +1/+1 counter on Redcap Gutter-Dweller
That being said, I am surrounded by a multitude of people who are massive Doctor Who fans and they have expressed nothing but enthusiasm and excitement for the new Commander decks when it comes to theme
Kodama of the West Tree, for example, grants modified creatures trample and also allows you to grab a land from your deck and put it into play when a modified creature you control does combat damage to a player
Oriq agents stick to the dark corners of Arcavios, unseen yet ever-present
These different types of damage can be relevant in certain situations
Thankfully, that's it for Secret Lair's Secret Scare drops