While over 20 champions are set to be buffed, nerfed, and in some way adjusted in League of Legends Patch 13.4, no champion will be receiving as many changes as Thresh.
In Patch 13.4, Thresh will have a majority of his abilities overhauled, with Death Sentence (Q), Dark Passage (W), and Flay (E) all receiving tweaks. The changes to Thresh could aim to change the order in which players max his abilities, putting more of an emphasis on the damage output of Flay in the early-to-mid-game.