Making a Frog mostly unblockable might not help Kenrith, but if I've got Yargle and Multani, or just Yargle, Glutton of Urborg, in play, I will be well positioned to put some pressure on a tablemate's life total
This card can also easily be flickered/blinked if you need to recover the monarch
Like so many other cards over the years, they have become better at these things
They're not to be confused with the earlier black and white prototype cards, which featured Gameboy sprites, or the beta playtest cards used to try out the rules
Conversely, if a permanent is sacrificed during the resolution of a spell or ability, that spell or ability will finish resolving before Carmen, Cruel Skymarcher's second ability is put onto the stack
There's not much more to say here than I think this card is a nice way for Control to snag an early engine card from these decks, and then have room to Stock Up or Consult the Star Charts on the following turn