Gamebreaking: Ultra-Fast XP From Bugged Item (Patreon)

CONFIRMED WORKING: Note this is on the official forums and pretty much everywhere now so you won't have much time before a fix.

Note: I have not personally verified this and will update it shortly when I have tested it. Newer Patreons should be advised that owing to the time-sensitive nature of exploits  I will often do this before testing. Often I will downgrade or upgrade the status of a play after doing this, though generally speaking if I post at all the play will work on some level since I have to trust the source.

A Patreon is reporting a major glitch with certain potions which are not supposed to stack allowing the user to benefit from multiple buffs at once.  

Snoonoze writes:

 right now the exp potions are bugged and can stack. if you activate them 1 at a time while they arent stacked in your bags...ive got 50% exp buff from 5 potion buffs 

Snoonoze is referring to the item "Draught Of The Ten Lands": https://www.wowhead.com/item=166750/draught-of-ten-lands

From those who are not familiar with the split'n'stack glitch it works this way:

If you use an item which gives you a buff normally then subsequent applications simply overwrite the initial buff. 

Sometimes if you move a buff item into a different inventory slot, using left-click and shift to break up a stack, then use it, it will add an additional buff.

In this case what is supposed to happen is that using a second xp potion just overwrites the  timer on the first but what actually happens is you get two xp potions and a 20% boost to xp.