Well, here’s my thinking on it:
Exert Influence - a great card, though in decks which pretty reliably fill all 3 creature spots quickly, it’s obviously a no-go. Possible keep, could be replaced with Turn to Frog or some other removal spell.
Hangarback Walker - in Saheeli’s deck as it exists now, this is basically just a “win more” card, however if we want to keep the Thopter-theme core of the deck, we could keep it if we can build up some decent mana ramp. Possible keep.
Brutal Expulsion - It’s alright I guess, though not the best removal spell IMO. Possible keep.
Shivan Reef - Might as well keep it I guess. We’ll have to add some other mana-gaining supports, of course.
Chandra’s Ignition - Meh. Doesn’t help vs. Runaway carriage OR Gaea’s Revenge, the two big hexproof threats out there. Lose.
Chief of the Foundry - This guy does nothing for this deck except “be a construct”. Lose.
Foundry of the Consuls - You could pay 11 mana to do this, OR you could pay a trivial amount of loyalty instead. Lose.
Thopter Spy Network - This, this is the core of the deck right here. A great card and it works great with all 3 of Saheeli’s abilities. Keep.
Pia and Kiran Nalaar - In some decks, a great card. Here, unimpressive at best and potentially counterproductive if you blow up too many of your own supports. Lose.
Mirrorpool - Okay, Mirrorpool is an amazing card. It is the mythic I want most out of all the cards in this game right now. But in this deck, it is disproportionately likely to get you an additional 1/1 thopter. The other creatures in your deck are there for their abilities, not their size, and we’re not actually running many spells that you would just want to chain off. Thopter Spy Network wants supports that will stick around, anyhow. Can’t believe I’m gonna say this, but Lose.
Alhamaret’s Archive - Hmm, we don’t ever gain life with this deck and we don’t really have trouble with card draw. I’d rather have almost any other support. Lose.
Sphinx of the Final Word - Hexproof is so, so good. And our deck strategy is fundamentally about building up a gigantic stack of thopters, that giant stack is vulnerable to spot removal, or worse yet, having it get stolen. Plus I like this guy, I run him in almost every blue deck. Keep.
That gives us a deck of:
- Thopter Spy Network
- Sphinx of the Final Word
- Shivan Reef
as well as possibly:
Hangarback Walker
some spot removal spells (Exert Influence, Brutal Expulsion, and/or some other stuff)
and at least 4 empty slots. We need: more supports to make sure Spy Network is firing, and mana gain like whoa. Lastly we need some ways of dealing with hexproof baddies (especially carriage).
Obvious includes: Drownyard Temple, Shrine of the Forsaken Gods. With these two we can probably run Hangarback and not feel foolish for doing so. True-Faith censer is both a cheap support to benefit Thopter Spy Network, and a common way of dealing with yonder carriage. Giving your giant stack of thopters vigilance will deal with a lot of other things, too.
So now our deck is:
- Thopter Spy Network
- Sphinx of the Final Word
- Shivan Reef
- Drownyard Temple
- Shrine of the Forsaken Gods
- Hangarback Walker
- True-Faith Censer
5 supports, which might even be more than we’re allowed to run (in which case, drop Shivan Reef, duh), 2 creatures, 0 spells. We’ll assume we’re maxed on supports (and in any case, you may want to make sure her 3rd ability is likely to pull a Spy Network if you’re not drawing it), and that we should add in some spells but not too many, as she doesn’t seem like a spell-heavy PW judging from the deck we started with.
We can leave in both our spot removal spells and still have 1 card left over just for fun. My personal pick here is going to be Barrage Tyrant, because it’ll either throw a Hangarback at our opponent, giving us 8 more thopters on demand, or it’ll throw a fat stack of thopters at them, which is probably GG right there. Obviously you could run Drowner of Hope instead and, combined with Spy Network, we’ll lock down all our opponents creatures forever, but Drowner is broken and playing it in this deck would make me feel like a jerk, whereas using a Barrage Tyrant to throw a huge thopter stack just makes me giggle maniacally instead. It’s all about priorities, ya know?