Apart from mutate cards to trigger that ability, I guess you could use Stuffy Doll and Brash Taunter, or fill your deck with cards that grant abilities to your commander like backgrounds and the legendary familiars (Kediss, Falthis, et al)
Creature types can represent species (such as Human, Zombie and Merfolk) or roles (such as Warrior, Scout and Wizard)
When its backed up with cheap counterspells and card advantage engines, its incredibly hard to beat
Deep from the woods of Argoth come some powerful cards in The Brothers War
Graded Population Report: John Silver - Alien Pirate [Foil] #82 Visualize the distrbution of grades in the chart
I expect you can get $20 for these in 12 months or less, and from there theyll keep heading upwards until it sees a reprint (which wont be for a while)