Scatter damage is always going to be worse than “all enemies” damage, but that’s because scatter damage gets better the fewer targets there are. Here’s my Phoenicia team:

So it’s going to do (66+16)*2 damage to all enemies. That’s 164 damage, times four, for 656 total damage. That’s A LOT of damage. But if I have only two enemies, then it’s 328 damage. That’s still a lot, absolutely. 160ish single target damage is huge, but it’s reliant on a lot of things for Phoenicia. It takes a couple turns to fill her mana back up (that’s what Flammifer is for though). Let me try to whip together a Divine team.

I’m going to remove all the brown gems, because it will leave me with a really good board position afterward. That will give me (77+30)=107 scatter damage, or 26 per target. Phoenicia does over SIX TIMES that amount per target. Here’s the current board before I cast:
Right after I cast:
Let’s use Divine Ishbaala:
Okay, now let’s remove purple:
Okay, Divine Ishbaala again:
Let’s get rid of blue gems this time…
Okay, another Divine Ishbaala cast:
And another one:
And now we’ll remove brown gems:
Okay, I think you get the idea…
The looping is crazy easy.