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Say what you want about the playability of the gods, but the truth is most of them are cool because of their abilities, not necessarily their stats. Sure, Thassa turns into a creature pretty regularly (especially in my Modern Merfolk deck), but most of the gods are cool because of their abilities.
That is, until Pharika.
I'm not going to say the ability isn't powerful, because it is. Deathtouch snakes are really powerful, as anyone who's seen the mightily impressive Sedge Scorpion can attest. And it is super flavorful, and fits well into Green/Black.
But that ability tacked onto an enchantment isn't exactly going to be tearing up Standard anytime soon.
But one thing Pharika does have going is that it's very efficiently-costed. After all, 5/5s for three are always good, and especially so if they have some extra power added on.
So how realistic is it going to be to actually turn on Pharika in Standard? Getting five devotion on top of the god itself is no mean feat, even if the payoff is super relevant. There are several double-green or double-black cards that see play already like Herald of Torment, but it's hard to see this really fitting into those decks. Maybe the best way to use Pharika is to work a black splash into the mono-green aggro decks, something that can actually be accomplished much more easily thanks to Mana Confluence.
But still, the aggro route seems like a stretch. That means it would be a midrange or control role for Pharika, and I can actually see it possibly existing in a deck that wants Reaper of the Wilds or Vraska. I can see something like that both making good use of the second ability and also occasionally turning on Pharika thanks to random mana dorks and the like.