I believe Infernities come in two forms: beetle-based and avenger-based until I read about the loop with Brionac, hundred eyes dragon and leviair. I think that build might replace plaguespreader with a beetle. Anyway, WC2011 Infernity can never be complete due to no Infernity Barriers, although I am also missing hundred eyes. That card is a staple for Infernity.
3 MST is not required.