Avoid this: stick to two colors if you can, or draft mana fixing, or both
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
This card began at #2 on my list but then dropped a bit here and there
Clear busted combos in Commander, but casting this kindred enchantment in Modern is no easy feat
Jecht, Reluctant Guardian / Braskas Final Aeon Flipping Jecht, Reluctant Guardian takes work, but Braska's Final Aeon is well worth the effort
Troll of Khazad-dm, a common, wasnt a big individual loss but impacted the decks it enabled