Yes, that is why I mentioned 'unless you replace these with something else'... and by standard rainbow I mean ScaredGirls unupped/partially upped version and variants similar, but with mostly the same key cards... obviously other rainbows or mono/duo/trio decks used for fighting FG may find this shield more useful.
Anyway the thing I liked the most about FFQ is that fake gods waste their creature control spells on fireflys (queen quinted) so after a while I can play some key cards without quint. Right now I am thinking about using a Pharaoh for similar purpose... but I guess FFQ+hope and no-FFQ+thorn shield may be the way rainbows will go.
As for the fallen elf, heh... he just makes decks much better fun. I know he rarely has a chance to create a useful mutant early enough to turn the tide of battle, but he certainly makes it different each time. That's the biggest problem I see with alternatives, they are often boring.
Feral Bond... yes, it has a number of disadvantages... but has a great potential at giving masteries, so having one usually helps at that, especially with miracles. So I generally find it hurting the probability of winning, but increasing rewards when you do win, so might be worth using... but if I somehow design a Pharaoh FG deck able to start producing scarabs earlier, I might try using FB instead of SoGs... and anyway in real game I have only one SoG
But it seems that momentum is becoming more and more of a creature control spell... to protect your creatures from opponents creature control shields... I wonder if it becomes more useful at protection than quint