Im offering up a wide range of powerful utility lands in this article, and having an answer to those lands in your mana base is a no-brainer
For eternal formats, the power-level is so high that only a handful of new cards will actually be relevant
Sazhs Chocobo and Tifa Lockhart both have synergy here, and Choco, Seeker of Paradise, can easily close out games just by resolving and then swinging with the birds
In those matchups, Goblins in particular can struggle to handle threats like Akroma and Nishoba once they come down
You can also add more cards to support tokens or even a few more token producers like Halo Fountain or Court of Grace for tokens and card draw
When we talk about going uphill in oldschool magic, it usually means playing an unpowered and/or mono-colored deck