The important difference is that Siege-Gang Commander creates the tokens as part of its enters effect rather than forcing you to spend mana to create them
Whichever option you go for, Vishgraz scales up accordingly, meaning it wont be long before it doesnt even need toxic to wipe out your opponents in a handful of hits
Casual Commander can be very affordable, while competitive Modern, Legacy, Vintage, and high-end collecting can become expensive quickly
Suspicious Stowaway // Seafaring Werewolf This reminds me of a Looter il-Kor that sometimes upgrades to drawing cards instead of just looting, which is pretty nuts
Cards like Glimpse of Nature, The Great Henge, and Beast Whisperer reward casting creatures with card draw, and they often see play alongside mana acceleration