Today’s cards from Hearthstone: Whispers of the Old Gods fit well in control decks with slow tempo.
Dog revealed Thistle Tea, a six-mana Rogue spell that says: “draw a card. Add 2 extra copies of it to your hand.” It’s definitely an interesting card; having three Backstabs or Undercity Valiants could come in handy. Right now it’s too slow to fit in any popular Rogue builds. Malygos Rogue and Oil Rogue go full offensive and want to chip down the opponent as quickly as possible.
Once the new set and formats are released, everything is going to change. Control, Rogue might become a viable deck option, since a lot of the faster cards are leaving the game (won’t miss you Dr. Boom.) Undercity Huckster and Xari, Poisoned Mind are two cards coming in the new set that help keep hand control and board presence, perfect for a control deck.
Thistle Tea is also better than Sprint , Rogue’s current main draw-engine, in a control deck. You don’t want to thin out your deck, because then you hit fatigue faster in the control mirror match. With Thistle Tea you add cards to your hand while still keeping your deck the same size. It still falls to the RNG gods, so I doubt this card is going to see major play.
Next up is Twilight Summoner, Blizzard’s attempt at replacing the whole Nerubian Egg is going to leave behind when the format changes. For four mana you get a 1/1 minion with a Deathrattle that summons a 5/5 Faceless Destroyer. I would never use this card, even if a crazed lunatic put a gun against my head and forced me to play it on the ladder. It’s just so bad. Any Silence card just wrecks it, and if your opponent has nothing to break the 1/1 you aren’t going to see that 5/5. Sure, for the mana you're spending you’re getting a good deal, but the summoning conditions are just all out of whack.
The only place I can see Twilight Summoner finding some use is in N’zoth, The Corrupter deck. Summoning this guy along with some other Deathrattle minions could swing the game in your favor. That’s more of a “win more” strategy, meaning that it’s not a dependable strategy, but it can help you stay ahead when you already are.
Every set has to have some middle-of-the-road cards that won’t really see competitive play. Some people just enjoy building unique decks, and these cards are more for that player than the try-hard. Not everybody can be Cho’Gall, that guy’s awesome .