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Spectacle cares only that an opponent lost life during the turn, not that the opponent's life total is currently lower than it was

Frequently Asked Questions How much is Pachirisu worth

But you still need to find a way to draw some cards to actually damage your opponent or have a mana sink to use to convert your infinite mana into something useful, like Origin Spellbomb or Sunbeam Spellbomb, which you can use with Auriok Salvagers to bring back and sacrifice infinitely since you have infinite mana

I'm curious as to whether this will affect the environment

Adventures provide an instant or sorcery while also letting you fill your deck with creatures and other types of permanents