And Cetavolver, and Necravolver, and Rakavolver, and Anavolver. All of these would be very playable at {1} less.
Also, what the heck is a Volver?
Edit: Looking at the art, those definitely should have been Human Mutant, Merfolk Mutant, Zombie (???) Mutant, Minotaur Mutant, and Treefolk Mutant.