Hi everyone! So I've recently come in to about $200 worth of credit and wanted to build a new edh deck. I have a few different commanders I'm debating between and would like opinions on them, or suggestions on who I should run.
As already noted, you can build a strong Brago deck pretty cheap.
Personally, I think a stong Roon build would be more interesting and fun, because Brago tends to be pretty overpowering and a lot of players have seen all the Brago tricks and are pretty tired of them by now. Roon is pretty cheap to build, but being three-colored, the mana base will be a bit more clunky on a budget. As usual for three-color budget decks, I recommend basing your build around a lot of green land fetch stuff to get things going and including lots of basic lands.
Locust God is strong and offers a fair number of options for personalizing your build while still being pretty effective.
Gitrog can still be pretty gross on a budget though. You don't even need many of his "signature" cards to run the table. With that being said, it will run very similarly to your Karametra deck, so I don't know if that's a route you'd want to go down.
Like the others have stated, Brago can be super budget and still run efficiently as his bounce targets are usually on the cheaper end.
Roon would be very similar to Brago, but adds that third color for access to more targets and that mana ramp you definitely crave. Can still be pretty budget with adding in targets like Wood Elves.
(I play a Saffi Eriksdotter that would be very similar to how Roon would play and how I have wanted access to blue creatures...)
Locust God - play a bunch of draw spells. Literally every card in your deck could be a draw spell and you'd always be a threat (same with Niv-Mizzet, Parun).
The five color commanders would be fun, but you're definitely correct that you want that smooth mana base. Since those commanders are Tribal-based, the creatures wouldn't be as cheap either.
Out of your options, I'd look at the non-five color commanders with your current budget/credit.