If you are only going to play 2 gsz then
bloodbraid elf could be a great source of card advantage.
Also, chant it with me: scavenging ooze, scavenging ooze, scavenging ooze! Its a card that gives you a subtle edge in non-combo matchups and can do work against combo as well. I think its good enough to play x4, and probably maindeck. Tarmogoyf and Wrenn are everywhere. Scooze lets you break up that nonsense with a beater of your own. I understand its a wish target, but it really is that good (in my humble experience.)
Elvish Reclaimer is still pretty affordable, i think its an option to set up grove and utility lands like Ghost Quarter, Bojuka Bog, or Barbarian Ring.
Good luck! I have always been budget minded, especially in legacy.