I'd say to increase amount of basic lands, you have too many basic land tutors and very few basic lands.
Or at least remove
Myriad Landscape, since it tutors for two that share the type.
Lotus Field doesn't do much for deck which doesn't have many way to return lands from graveyard. At first glance I don't see anything other than
World Shaper which gets lands back (or that one creature which mills and allows you to get land back). You may also
consider Mending of Dominaria, which does the same thing (but it's an enchantment). Also
Lotus Field is 2+USD, so replacing it, frees some budget.
I'd say remove
Homestead Courage. I know flashback seems nice, but card is meh, +1/+1 counter at Sorcery Speed is useless. Also... you may
consider any of the Cycling Creatures which allow you to put Keyword tokens instead of Protection. I know you have bunch of things that add +1/+1 counters, but still... Or maybe instant protection from color due to targeted removal.
Light of Hope, I would say isn't Commander playable card, 4 life, doesn't mean much usually, destroy target enchantment, you want something that can target both enchantment and artifact, +1/+1 counters... unless it's a theme of the deck...
Mana Tithe... can catch someone offguard, but pay 1 usually isn't that big of the deal later on in the game. Sure sometimes people save just 1 mana for
Pongify, but when they don't... I think it's powerful card in constructed, because it screws up early play, and other player may not be able to catch up, but in Commander...
Lantern of Revealing and
Bonder's Ornament are... horrible.
I'd rather run
Seeker's Lantern than either of them.
Chromatic Lantern which you have in Maybeboard is great. But it's a 10USD card...
I'd think that Mutate creatures are bad for commander, even in Karador deck. They enter, thing that they were supposed to Mutate on, gets removed, they don't anything. Or if you're gonna stick with that, a lot more protection is needed imo, rather than +1/+1 counters, especially considering how few creatures have Trample or Flying in your deck. I've noticed a few thing care about being targeted too, but yeah...
Not really sure what you need
Illuminator Virtuoso for, since you can't Mutate on it, and you don't really want to waste +1/+1 counter cards on it.
Think you could easily remove all Connive creatures (other than
Body Launderer), and maybe replace them with things like
Wood Elves, or maybe even something like
Acidic Slime. If it's for putting cards in graveyard, you can easily play something like
Mire Triton. Or in those colors and in Karador deck especially,
Syr Konrad, the Grim, allows you to mill everyone, and every time you get something out of graveyard, pings something. And if anyone thinks of graveyard hate... Konrad could even kill them. Or you could actually win, by targeting your graveyard with card which removes everything from your graveyard,
Bojuka Bog for the win. lol
Chittering Harvester is too expensive mana wise, you're better of playing something cheaper like
Fleshbag Marauder or
Plaguecrafter. Even if you want to build Mutate stack, it's too expensive. Remove it anyway... even if you don't put Marauder or Crafter instead.