It can massively disrupt your opponents while catapulting you ahead in the game
This part isnt essential (and is only relevant once you have a few confirmed evaluations), but its something I like to do to develop my evaluation skills
The cards given the treatment are incredible, full of staples like Doubling Season, Exploration, Atraxa Praetors' Voice, Blood Moon, and Toxic Deluge, and the art is varied but mostly fantastic
Except for the listed exceptions, Malleable Impostor copies exactly what was printed on the original permanent and nothing more (unless that permanent is itself copying something or is a token
It's definitely an interesting choice of Ink types, as Amber/Amethyst is really focused on being hyper aggro - meaning the player is going to race their opponent to 20 Lore and try to do it as soon as possible