If she ever dies, you get to put X +1/+1 counters onto each legendary creature you control, where X is the number of +1/+1 counters on Aerith
By sacrificing your own board with it on the stack, and by pre-emptying your opponents yards with anything from a Soul-Guide Lantern to an Author of Shadows, you can simultaneously wipe the board, get a load of EtBs, and slingshot into the lead
Explosion blows your opponents out of the water and generally synergizes with your deck as anything interested in Fork effects wants spells worth copying
Evolves From Cards by hatachu Frequently Asked Questions How can I obtain the Kommo-o with 3-Diamonds rarity from the Celestial Guardians set
Being an Amber card, you have a lot of strong characters to choose from to fill this role: Mufasa, Betrayed Leader (how fitting), Hades, King Of Olympus, or Simba, Protective Cub (again, how fitting)
The raging waters had swept away trees, bridges, and even houses