Credit to skeletony for the icon
Unlimited Buff Slots - A mod brought to you by Rartrin and Dradonhunter11
Download link - Direct link from mod browser
Unlimited Buff Slots (or UBS) is a small mod that aims to remove the 22 buff limit and to rewrite a part of the buff system while keeping all existing buffs working (vanilla and modded).
Other mod to check out by the same creators:
Standalone - [1.3] tModLoader FNA (32bit/64bit) (Branch of tML)