Hearthpwn

I would definitely post it at least tier 2.  It stabilizes the board and your life total when dropped and gives you an infinite source of cards in hand to discard.

Fun: Definitely

Good / consistent: Absolutely not

I decided to craft a full Discolock deck because it looked like a lot of fun, and it is. But I would never put Jeklik on any tier list. I can usually reach rank 1-5 fairly easy with a tier 1 deck, but I'm about 40 games in with Discolock and still stuck at rank 14 wild. The huge RNG each time you have to discard a random card can also be frustrating a f. 

I have hade a pretty god run with discolock from rank 22 to 8 in wild. I often use Cataclysm turn 4 to discard 6 cards at once, often with a Jeklik in hand to start the duplicating process.
But it can be a bit random some time

"Fun" cards are generally put in tier 3 or lower if they are not:
1: Very important in a very powerful deck.
2: Solid tech options in a very powerful deck
3: Very important in a good performing deck.
4: Useful flexible cards for viable decks from many classes, especially as a classic.

High Priestess Jeklik is in tier 3. She  could be promoted to tier 2  for the 3rd category at some point, but the winrates for discolock are simply not there atm.

I made a good run with discolock this season, from rank 13 to rank 5 so the deck is definitly better now with Jeklik. If you're stuck at rank 14, the problem is probably your list or the way you're playing the deck. 

For me is tier 1 just for the fact that turns the quest into something usable AT ALL and creates a precedent with soulwarden for a viable way of FINALLY being able to use the discard mechanics.
As a warlock fan, it's my favourite card of the expansion.

TOO SOON! YOU POSTED THIS TOO SOON EXECUTUS!!

I haven't had the opportunity to check it yet, but how does Da Undatakah interact with Carnivorous Cube? I see them in lots of decks together.  If you cube, say, Hadronox, does Undatakah later get the cube's deathrattle with Hadronox inside?

I think it does nothing.

No, its deathrattle will do nothing.

That's kinda what I thought because it would be pretty ridiculous otherwise.  Good to know for sure anyways! 

Since the deathrattle is based on what the battlecry does, if Da Undatakah does copy Carnivorous Cube, he doesn't produce Hadronox, since he never technically destroyed Hadronox in the first place.

Just like if you had a Carnivorous Cube destroy another Carnivorous Cube that had destroyed, say, Oondasta, your secondCarnivorous Cube would do two things:
1.) trigger the first Cube's deathrattle, summoning two Oondasta
2.) set itself up to summon two Carnivorous Cubes when it dies

When those two Carnivorous Cubes die, they won't summon anything, because the deathrattle is based on what the battlecry does. If the battlecry never destroys a minion, it never puts the deathrattle "online," so to speak.

Also, Da Undataka copies the deathrattle as it's written on the cards, not the specifics of what you've set that deathrattle to do. He can't summon minions that another card (Carnivorous Cube) destroyed, but he can act as a Frostmaw if you have a dragon in hand, because the deathrattle reads that way on the card.

I hope that wasn't too convoluted an explanation.

EDIT: Took me 5 minutes to write what everyone else wrote in 30 seconds lol.

Here's how to think about it:

Minions that have a bare Deathrattle: keyword will benefit Da Unda when they die and will have a triggerable deathrattle if they pop out of a Cube. 

Minions that gain a Deathrattle via their Battlecry will not do either of those things.

Triggers the death rattles as per usual when you pop it with the cube, then you get 2 vanilla pile of stats after the cube pops. 

Been thinking about Crafting Zihi, but it feels more like a tech card. Some decks I want to play run him, but I’m not convinced he’s a key card yet.

Overall, great advice!

Mojomaster Zihi is actually at the very top of tier 2 atm and might be promoted to tier 1 in the near future, similar to what happened to Zilliax when BDP was released.