Dragon Mantle could be pretty sick here!

DevotedShepherd agreed; you’d only want one or the other I think, and it’s the better of the two.

Thraben Inspector’s always a fantastic White Pauper include!

Force of Virtue and Leyline of the Meek are decent options - buff the Goats, and get more Goats for free when Springjack Shepherd comes in!

Afraid to say that Bonder's Ornament’s soon to be banned - I know it’s not quite a replacement, but I really like Witching Well. Great for early turns, perfectly fine for later, and it has an ETB effect for Cascade!

Call of the Death-Dweller would do so much work here - menace, deathtouch, and you can sac your own creatures more often for value

Bugger, nvm, not common… Blood Curdle isn’t a terrible shout though, even as sideboard tech

Wild Cantor’s not a terrible one-drop here, if you’re desperate.

Looter il-Kor and Wharf Infiltrator are worth a look - maybe as sideboard pieces? Essentially unblockable if you wait to buff them until after blocker step.

Nice! Very thought-through, I like the detail you’ve gone into.

Only thing I’d recommend perhaps is switching Skyclave Cleric  ^Flip for Charming Prince - much more versatility and value. I’m not sure the flip side of Cleric is worth it, tbh, with 25 lands already. I’d say either swap that out, or ditch a land for something else, making use of the tap lands.

Neat combo! Like this a lot, and comparatively cheap, too.

Just so you’re aware, there’s a lot of support for this support in Green and Blue - both Ulvenwald Mysteries and Lonis, Cryptozoologist can be good, if you’re looking for options.

Also, Genesis Chamber probably slots right in here - you can even turn it off with Clock of Omens on your opponents’ turns!

Reynan sadly not Modern-legal, would be stunning

Metallic Mimic’s always a solid shout for tribal decks, and Usher of the Fallen is a fantastic aggro card, though this deck feels a little too controlling and slow for them perhaps.

I quite like Spectral Sailor here, but you likely don’t need it to be honest. Looks good!

Carrot_cake ahhh but it makes pigeons you see. (Almost) to your heart’s content

Mirror Entity could be a cool addition here, for later turns.

In addition to Balaam__’s comments above, I’d recommend four copies of Metallic Mimic, and at least two Masked Vandals in sideboard or mainboard.

Love it; Pride of the Clouds could be pretty neat here.

You’ve really done your research, bloody impressive. Just so you know, you can put text into accordions - sections that you can open and close. Would make all that data easier to find and read.

Blades of Velis Vel is also pretty sweet pump, but can understand it likely doesn’t have a slot.

I’d recommend Aven Eternal over Scrapskin Drake, and Dreadhorde Invasion is pretty fly. Larder Zombie’s not insane but could push the deck a little further.

Overall I’d probably say drop some two-ofs for more three- and four-ofs, for consistency’s sake. Sibsig Host, Tattered Drake and Necromaster Dragon would be good candidates to ditch - just very expensive for effects which aren’t that incredible. Neat deck, good luck!

If only you were in blue, Release to the Wind could be devastating here!

Alas, as it stands, some good recommendations might be Chainer, Nightmare Adept and Conspiracy Theorist, though perhaps both too slow for this deck.