Hearthpwn

Just got it using a Silver Hand Pally.
Had to remember not to use Consecration xP
Killed Tyrantus with Equality

Wait so it's Tad... Pole... Ohhh...

Everyone wants to give Tad's Pole a swing ( ͡° ͜ʖ ͡°)

This easily won the game for me against Azari, the Devourer. I'm lucky that I got it on turn 2 right after he burned 3 of my cards. It kept pulling all the big minions from his deck while I barely played anything from mine. What a counter to that hero power, who needs my deck anyway when I can use his! 

What a lucky run. Before this, right after Tad (a rare boss) I got The Trapped Room (another rare boss, though it doesn't give you anything except a really hard time). Luckily enough he didn't get any minions in his hand before it was full so I just kept ending turn until he died from fatigue. 

I had to learn this the hard way: do not Entomb any of Tad's minions! You won't get the weapon unless you Kill all of his minions. 

Do not... I repeat... DO NOT take this with Druid.

I manage to get it, in a priest run which btw I haven't completed even once (150 bosses beaten).
I got to  the dragon boss "Vustrasz the ancient" who got it from my deck with Drakonid Operative just my fkn luck....

Are there any other secret items like this one? I know if you get both pieces of the quel delar your get an OP weapon.

Here you go: I got it:

1.) Let Tad take no damage

2.) Surpass/kill all his minions

3.) Wait a turn after.

https://imgur.com/a/hfCue

The thing is OP and DEFINITELY worth to get. I crushed Bristlesnarl as 7th boss and Vustrasz. Crush them to the point where I intentionally made them go through all their cards to see if they have easter eggs (Answer is no). :)

Does it steal the minion from your opponents deck (recruit) or just copy it?

It steals it. Recruit takes the minion. It doesn't summon a copy or anything.

Definitely worth trying to get for the final bosses.

He drops the treasure chest on turn 11, but tad can't take any damage, which basically means you have to keep board control and even kill the 4/1 crab that does damage to tad.