Prismatic Evolutions focuses mainly on Eevee and Eevee's many evolutions, often referred to as "Eeveelutions" by fans
Like Pokemon, they don't only have attack skills, but can also be used to heal and support the rest of your galaxy-hopping team
Lumbering Battlement especially loves Reveillark, which triggers on leaving the battlefield, not just dying
His body is pretty irrelevant as he is almost never involved in combat and he would probably be a better cube card if he were a 0/2 as he is very vulnerable and desirable to kill
The message sounds somewhat smug (and it can certainly be delivered in that way) but being reminded to slow down and double-check the card text is never really bad advice in the complicated world of card games
This, coupled with the fact that Tifa is the FF7 deck's alternate commander to Cloud, does mean Tifa seems to be getting a bit more love than Aerith in the crossover, though there are still more cards to be revealed