Don't we all agree though that in a control/combo matchup (in combination with y'shaarj, of course) its effect is unfair and op, reducing the opponent's chances to win by roughly 75/80%?!?
Control players are refusing to main deck Elysiana, so no, this is not unfair in the slightest. A direct card for card counter exists and players are not using it. I laddered to legend this month exclusively with a control Shaman list that had no win condition except for fatigue. If Tickatus missed my Elysiana (he’s effectively only 1 in 6 to hit her each time he’s played and I would keep her in the mulligan and play double far sight to get to her ASAP), they had absolutely no chance to win because I could clear every single board and had up to 4 heals for 20 per game. As my deck was -10 +10, they fatigued sooner due to offset from life tap. I was more than happy with a 70% win rate in this matchup.
Warlock cannot have a late game control deck unless it has this kind of option, because life tap is counterintuitive to the deck’s win condition so without cards like Azari and Tickatus, warlock is limited to one old, shitty and boring aggro concept that they’ve had since the dawn of hearthstone (since apparently devs won’t allow handlock or any other decent midrange warlock deck to happen again for some weird reason).
As far as beating combo decks goes, I have actually always loved combo breakers in hearthstone because there is such limited disruption available. I like that Tickatus has a pretty much even shot at disrupting a combo. When you actually run the numbers, he is a lot fairer than Mindrender Illucia, who gives you significantly more control over your opponent’s win condition, and a significantly higher chance to hit it (especially as most current combos have a required set up or conditions that must be met before they work, you often know exactly when to play her, while Tickatus is mostly just random, late game vs C’thun being a rare exception).
What I would like to see, rather than a nerf to Tickatus, is a skill-based counterplay card released when Elysiana rotates (something akin to Dirty Rat from MSoG) as I do think he will become a toxic presence once his hard negator is removed.