The cape feather from SMW is missing. That's the one I was going to choose.
I voted Star power up but the Hammer Bros Hammer from Super Mario 3 was hella underratted. It could take out Chomps if I'm not mistaken.
I've always been a fan of the fireflower.
Shout-out to the hammer man suit
But I chose other. The frog suit was my favorite! I hated the (under)water stages so that shyt was my best friend growing up lol
Shiiiiit, the frog suit made the sky stages pretty easy too.
Super Mario 3