As it enters, choose a color
It turns all historic permanents into 7/7 Dinosaurs when they enter the battlefield
A 'most flamboyant' captain who hides his age, apparently
Of course, being a 3/2 there's plenty that this dies to, and can be blocked by, but it has its own defensive mechanisms with those counters, which makes attacking a bit more palatable
Arnos option to be cast facedown as a disguised creature is fine in an environment with other face down creatures, but it's basically useless if Arno's your Rakdos commander
Revered Unicorn still feels unplayable in a normal deck, but you can generate an interesting lifegain loop with Emiel the Blessed