I need a Creeper farm [Minecraft]

Mostly for potions ~~~ Rules(look at me, being all professional and stuff): * Be nice * Don't spam... too much * Don't tell me what to play unless I actually asked for it ~~~ My Lore Webtoon: https://www.webtoons.com/en/canvas/dreaming-in-lost-carcosa/list?title_no=1103659 Commissions here: https://vgen.co/LiliFactotum Have questions for me?: https://www.tumblr.com/lilihalifactotum?source=share