It's an all right concept, but tough to pull off.
When you really break it down, the difference between why Survival and Reanimate can pull it off is its ability to tutor for the combo/win instantly, that's what it really comes down to.
Pox doesn't really have a reasonable way of tutoring for the "creature piece" & "reanimate piece", so instead it mainly relies on just going for the
consistency approach, running multiples of bloodghast/ravens, for example, as discard outlets.
Reanimate can pull it off with entomb, it also runs careful study. These could be mixed in with Pox, but then again a deck that already runs symmetrical spells and card disadvantage really can't afford more card disadvantage like entomb & careful study. I could be wrong, but you'd run yourself out of hand fast which is risky.
The difference between Tombstalker (why it works) vs. Inkwell, Iona, etc. is that you can pretty much draw into him after the fact, whereas with the ladder you'd require them to be in your hand as you play your Pox, which actually leaves your hand more delicate. And like I posted above, I really think Pox's gameplan is to mess up
those decks that try to go for that kind of thing. I support Reanimate by itself, since it can be used against opponent and is versatile because of that, but the more combo that gets thrown in the more you wreck your consistency.
If I was going to mix in something like Iona though, I'd probably run
Sensei's Divining Top,
Sign in Blood, and such. I don't know.. maybe even
Mulch and go for more of a BG Loam approach. It'd be fun if someone was able to pull it off though. Sorry if I'm talking everyone to death, it's soo empty at work today lol.