You may put a legendary playtest card from among them onto the battlefield
At worst, you can unlock Cadaver Lab to return a creature to your hand and get the first trigger without needing other cards
So, gather up your friends, take another look through the Card Image Gallery, make sure you're preregistered at your local store, and get ready to come out to the Prerelease and have fun
One of my favorites is caricature where you take a real object or person and focus on some absurd aspect by grossly over-exaggerating it
The pros being that it is a creature that can potentially have an Indestructible counter on it that can attack and block
But, that's another great home for it, I just wouldn't call it "fair" unless it's a Rakdos Dragonstorm non-combo one, I could see that work