Its good in token strategies that use effects like Doubling Season since it gives them a little resilience to board wipes, and it even works in dragon tribal decks that care about the quantity of their dragons more than their quality
18 Vishgraz, The Doomhive Preconstructed Terror Suggested Cards: Phyresis Outbreak, Skrelv's Hive, Phyrexian Swarmlord While Vishgraz is a slow-burn commander, it is great for infect decks
Four mana for a 4/4 reach creature is already a good enough stat line that any red deck will happily play it
It also asks a couple of questions of deckbuilders considering it: "How much do you want a bunch of 1/1 Insects, and are you willing to play mono-green to get them?" Looking at the available data, the answer seems to be, "not all that often." That is, unless you're running an Insect kindred Commander deck with Zask, Skittering Swarmlord, Xira, the Golden Sting, or Vrestin, Menoptra Leader, in which case the answer is still just "sometimes." 14