As an added bonus, if a Legendary Creature enters the battlefield, there is no cost to equip it
Pol Jamaar will be better than the Titan for some builds JUMPSTART 25 SET REVIEW: BLACK Fumulus, the Infestation wants nothing more than to be auto-corrected to Cumulus
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)
Its one toughness is barely a drawback when threshold is activated, since you can pay three to drag him back to the battlefield tapped and attacking
So much value
There are a whole host of more affordable, but still awesome, cards you can find on the secondary market for a few dollars each