@MansonMat,
So the immediate problem I see is that you're trying to run legendary and non-legendary cards together as a theme, while I think it can work just fine, it'll be very difficult to fit a tertiary theme, and it will be finicky sometimes because they will kinda of grind against each other. Kiki-Jiki, Mirror Breaker only works with non-legendary creatures. If you get a few non-legendary creatures out with Jalira, Master Polymorphist and have Heroes' Podium it's going to feel kind of bad, but it'll feel pretty good to have a it with a bunch of legends. Mirari's Wake might fit better for you.

SO relatively, I only added white pretty recently and I only have 5 white cards. Felidar Guardian because it's basically twin combo with Saheeli Rai, but also works with Kiki-Jiki, Restoration Angel I view as a protection spell that just happens to work with Kiki-Jiki. Tamiyo, Field Researcher (combos with Doubling Season and is good value), Anointed Procession (more Doubling Season/Parallel Lives effects), and Teferi's Protection (should be in every deck that can run it as it protects from Cyclonic Rift).

So if I hadn't changed this deck recently I could probably use some of your ideas and then I'd put in Village Bell-Ringer but I don't actually have a reason to just untap most creatures for just value if I need to, having only 5 creatures with Untap abilities anymore, and they are more just either combos themselves or combo protection. Say if I have Tidewater Minion and Kiora's Follower and I go to combo off with Minion and someone just Doom Blade's it I can use Follower to untap Minion and then just float literally billions of mana, here I could use Village Bell-ringer and it'd be the same thing, but Kiora's Follower can untap land for me as well, Bell-ringer can't normally, for me. So if you have more activated abilities Bell-ringer will work for you, and I'd also recommend Thousand-Year Elixir and Illusionist's Bracers if you're not already running them.

I don't play cards that can give my opponents value. Kynaios and Tiro of Meletis is the only thing I run basically just for colors. I have to be in a tight spot in order to actually cast it, and it should be a partner commander combination but I had been at such a loss of what even to take out of the deck in order to get a partner combination in here. So I don't play cards like Selvala, Explorer Returned because she gives too much value to opponent's, and again I don't even play K&T unless I have to and I'd rather have partner commanders.

Just make sure all your Twin combo targets can do other things, like, I don't run Breaching Hippocamp because it doens't provide enough for me, while others like Zealous Conscripts can just take someone's Planeswalker and ult them or someone else's kiki-jiki and win, I've used Deceiver Exarch to tap down Blightsteel Colossus and prevent an attack. Interactions.