I think at best I would take 1 tyrannofex and 1 dakkafex. If you have the pod you can decide per game on which to drop in, but I have to agree with huggies01. The Tfex is just too expensive for what it can do and gets tar pitted way to easy. Against hordge lists, yes it would be amazing to have 2 Tfexs drop in with pods, but against anything else, you are wasting the points. Plus against hordes, it is cheaper to field 3 biovores to drop large pie plates every turn, rather then risk missing 1 or 2 turns of flamery goodness.