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A lot of balance and care goes into choosing the cost of a card, more than I can express here, but looking for similar effects on existing Magic cards can give you an idea of a fair costfor example, a ramp spell that puts two lands into play ought to cost 4 mana, per Explosive Vegetation

Its an incredible aura, even in decks that dont care about enchantments

There are a bunch of unanswered questions around maximizing companion, but Lurrus eliminates half the puzzle by naturally slotting in a bunch of homes without any real deckbuilding restrictions

With Fangorn in play, unspent green mana doesn't disappear as phases and turns end, bypassing the main limitation of adding mana to the mana pool

Exception #3 - Twisted miscuts