Troll of Khazad-dm, a common, wasnt a big individual loss but impacted the decks it enabled
Avoid this: stick to two colors if you can, or draft mana fixing, or both
Primeval Titan into Wolf Run Inkmoth Nexus has been a game plan for many a deck in many a format and that would work in this list better than most
You need another win condition in addition to Uro though, and you want that win condition to both be instant-speed and relevant against aggressive decks if possible, so whilst Coatl isnt at its very best here it still feels like the best option for its slot
Jecht, Reluctant Guardian / Braskas Final Aeon Flipping Jecht, Reluctant Guardian takes work, but Braska's Final Aeon is well worth the effort
This card began at #2 on my list but then dropped a bit here and there