Mono-Green in the Woods follows the Pacific Old School rules with the following exceptions:
Deck Construction
Your deck may only contain basic Forests, non-basic lands, artifacts, and mono-green cards originally printed in Alpha, Beta, Arabian Nights, Antiquities, Legends, The Dark, and Fallen Empires.
Updated 2023-08-12: Additionally, you may play no more than 4 artifact cards in your deck.
There are no restricted or banned cards in Mono-Green in the Woods, unless you are not playing for ante (then the ante cards are banned, of course). Yes, that means you can play 4 Black Lotus, if you really want. And yes, you can play Elves of Deep Shadow.
Here's a Scryfall search link that shows you all of the legal cards: Legal Cards
Reprints with original frame and original art are fine, e.g. your Chronicles Ernham Djinn is fine, but your 7th Edition Untamed Wilds is not.
There are no sideboards in Mono-Green in the Woods.
Gameplay
Matches of Mono-Green in the Woods usually consist of only a single game. You must play unsleeved, without a playmat, on an unclean and/or rough surface. Watch out for that sap on that tree stump!
If you and your opponent do not both agree to play for ante, both players should remove all of the ante cards from their decks and replace them with other legal cards. After doing so, both players must still present a legal deck, according to the deck construction rules listed above.
Errata for Ring of Ma'rûf
Ring of Ma’rûf
{5}
Artifact
{5}, Tap, Exile Ring of Ma’rûf: The next time you would draw a card this turn, instead choose a colorless or mono-green card you own from outside the game, and put it into your hand.
Note: this maybe be used to get any colorless or mono-green card you own from outside the game that would otherwise be legal for the game in which Ring of Ma’rûf is activated. You can get your 5th Black Lotus, but you can't get an ante card during a non-ante game or any other card that is illegal according to the deck building rules listed above.