It also features the character's iconic breathing sound effects
If your tenth permanent enters the battlefield and then a permanent leaves the battlefield immediately afterwards (most likely due to the "legend rule" or due to being a creature with 0 toughness), you get the city's blessing before it leaves the battlefield
You can find my other precon upgrades here: Explorers of the Deep is a Blue / Green Merfolk deck with a +1/+1 Counter subtheme
Still, it's an upgrade to the archetype and another step towards making it viable
The downside, of course, is getting Kaalia to attack safely, but with cards like Anger in your graveyard or by equipping it with Lightning Greaves, you can bypass this hurdle and start flooding the board with oversized creatures like Iona, Shield of Emeria or Griselbrand (or, you know, cards that aren't banned in Commander)