Reclamation Sageremoval$0.19Very close functional replacement that destroys an artifact or enchantment on entering the battlefield, but at a lower mana cost. It is one of the cleanest upgrades to Indrik Stomphowler.
Woodfall Primusremoval$0.72Also provides an enters-the-battlefield destroy effect and can hit any noncreature permanent, making it broader and more powerful. It costs significantly more, but offers much higher impact.
Acidic Slimeremoval$0.19Similar ETB permanent removal creature, trading artifact/enchantment only for any permanent with deathtouch attached. It is a little cheaper and very flexible in green decks.
Bane of Progressremoval$3.87A green creature that clears out artifacts and enchantments in a much bigger sweep, serving the same anti-artifact/enchantment role. It costs more, but can completely reset board states.
Wickerbough Elderremoval$0.13Functionally similar as a green creature that removes an artifact or enchantment, though it uses an activated ability instead of an ETB trigger. It is a solid budget-style answer in the same color.
Cankerbloomremoval$0.45A cheaper green utility creature that can remove an artifact or enchantment, with additional flexibility from its other mode. It fills the same deck slot at a much lower cost.
Caustic Caterpillarremoval$0.27A very low-cost green creature that sacrifices itself to destroy an artifact or enchantment. It is less immediate than an ETB trigger, but it is an efficient budget substitute.
Elder Gargarothutility$3.79Not direct removal, but it occupies a similar green midrange creature slot with high board impact and value on resolution. It is a strong alternative if you want a threat rather than a one-shot answer.