No , you cant mutate onto a changeling
There are enough birds (especially tokens) in this set for this to turn into a nice play that kills an opposing creature, but not all decks will have enough of them
Questing Druid Questing Druids adventure effectively draws three for 1R, even though one of them is Quirion Dryada relatively under-statted creature by 2023 standards, but still fine
Scrambleverse You cant make a Scrambleverse without cracking a few eggs
For example, if Doctor Doom is dealt what would be lethal damage and then he loses indestructible (probably because you lose control of all your artifact creatures and Plans), he'll be destroyed the next time state-based actions are performed
The mono U delver decks in pauper have really no hard permenent removal, but it just dosen't matter when you are beating in with threats while keeping the opponents threats off the board