Finally, a reasonable suggestion in the first replies to a topic like this. 
You should have tried it against singleton Warrior when plagues still used to disrupt the mechanic, so it was a race of who’d play the relevant cards first, roughly Brann vs Helya.
With dozens of games played, you’d find Helya always to be one of the bottom cards maybe 19 times out of 20, moreover, they’d be guaranteed to dodge any plagues like real pros and play their key cards on curve.
By the way, according to my rough estimates, those in whose favour the game is rigged have roughly 5-10 times greater chances to find a single copy of the card that they need, having 20+ cards still left in their deck and little to none active drawing engines, than you getting at least a single copy out of two available, despite having drawn half of your deck or more and mulliganned aggressively for it.
They don’t start topics that the game is rigged, though. They either swagger, e.g. like this:
— or make troll posts against those who point out that something is… suspicious with the game’s supposedly ‘random’ effects.
Oh, when you don’t need it, this card will be virtually guaranteed to show up in your starting hand — especially in the next match after the one that you’ve just lost, having been looking for the card for the whole game. There was a topic about it, but I can’t find it right now — could have been deleted.
[UPD] Found it: Oh, There You Are .
So yeah, in short, the card(s) you’re looking for has a substantial ‘bonus’ chance (close to 100%) to never show up in the match where you need it, no matter the odds, and then show up in the starting hand of your next one if it’s (situationally) useless in that match-up — just to rub it in.
Who is this “y’all” that you speak of, some lesser spawn of the old gods? By the way, you don’t really ‘read in the forums’, that’s a wrong preposition choice, but otherwise — you’ve noticed the obvious, namely the lack of reading skills.
Maybe you don’t know these forums so well just yet. Welcome… to the machine.
Spoiler:
I should add that they are often first to comment in any new topic with their stock replies.
The aforesaid statements in general pertain to this topic as well.
Which is what you’d expect on average, by the way.
By the way, in case it wasn’t clear, that’s a possible reason, according to the theory described above, why they’re getting it so consistently — exactly because they don’t strictly need it. Aren’t the bulk of those Plague DK players F2P guys with a loaner or free deck anyway? Thus, they very well might be on the receiving end of what they call ‘The Algorithm’ — the one doling out their dues to players.