This mana can't be spent to cast a nonartifact spell.") Sarinth Greatwurm's second ability triggers whenever a land enters the battlefield under any player's control, not just under your control
Perhaps theres space for this card alongside Aftermath Analyst and Lumra, Bellow of the Woods in a Standard or Pioneer brew in addition to Modern
Sure, there are a bunch that are high dollar value, but dont let the cheap ones dissuade you from including them in your decks
Since the card is currently only being played in just one modern deck, I personally had it in the third spot behind the best blue reactive spells in the format, Counterspell and Force of Negation, but I can see the number one spot going to the best and most efficient threat the color has to offer
You could do worse than Endless Wurm paired with things like Rancor, Aspect of Mongoose, Fortitude, and Spreading Algae if youre looking for enchantment casting triggers