I can tell that the draw probability for infestor has been materially changed. I think they did that as a temporary fix until the next balance change goes out. I don’t think they want to send out a patch changing just one card. This does push out infestor play a few turns which is one of the balance changes I thought they needed to do. Increasing the draw probability has the same effect as increasing the mana cost of the card.
Put your tinfoil hats on guys. Time to discuss how blizzard tinkers with draw probability on specific cards in secret. 
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The probability to draw a specific card is a fraction of the number of copies of the card in your deck and the number of cards in your deck. That’s the end of it. There’s no other modifier to this, just your own cognitive biases when facing randomness.
I see no difference.
What?
You mean decreasing the mana cost of the card?
The patch is not live yet.