Sigh... this is why whenever someone screams strawman i shake my head and wonder if there will be any sense left to talk to.
I said personally attacking your COMMENT not you. Read the comment. You will be surprised that if you take a deep breath and calm yourself before you read things, you will often make more sense of them.
So let us start off with facts rather than opinions.
Deny is only strong vs SOME decks.... others it feels like deny is a waste of space. If your deck is one that is weak to deny, then figure out some way around it. Its a strategy game not "everything works all the time and everyone is a winner." This is a FACT.
Deny is 3 cost and is able to deny 7 and 9 cost spells, even a 12 cost spell ONLY if they are slow or fast spells, and if you so happen to make use of it on an ability of a unit.... kudos for you because the great majority of abilities of units happen instantly. This is a FACT.
The probability of drawing a deny starts out at 7.5% chance and roughly goes up by .3% every card draw. Not horrible odds, but honestly the chances are against you getting them. If you happen to draw 1 on the first card.... that is 2/39. You are down to 5.1% chance with roughly .14% chance increasing per draw. If you happen to draw 2 in the first 2 cards... that is a roughly .38% chance with (assuming you drew the first deny and that factor does not change and it is only the chance of drawing the second being changed) roughly .105% chance increase with every card drawn. Feel free to do the math and check this FACT.
With these facts... sure, it may feel like it is op and it may seem on paper to be op... but honestly the odds are stacked against you getting them, and with them, you have to use them wisely. If someone does, then it is no different than someone holding onto a mystic shot in order to kill Katarina, who unless they block with her/you challenger her, will never die because every time she attacks she has first strike and will just return to the hand before any damage is done to her. Or a mystic shot to hit an elusive that you might otherwise be unable to touch.... etc. For 2 cost 2 damage Mystic Shot can kill a great number of things.