Does anyone else feel that the free bosters have a much better drop rate recently? I agree with everyone that the BBs are often frustrating, but in the last two weeks I got Brood Butcher, Deathcap Cultivator and Inexorable Blob from them. Is that just a lucky streak or did other have a similar experience?
My daily reward fat pack also gave me two rares and a mythic yesterday (all of which I didn’t have already), so maybe the stars just align well for me at the moment. 
Stars have simply shifted out of place for me to align for you. Enjoy the good streak haha.
Surely not for me. Getting common/uncommon duplicates only since a month or so…
Just your luck mate. For me free boosters are a waste of time and got not even one rare from my bb, same as last month.
Open enough free boosters and you’ll get some good stuff. Open enough free boosters, and eventually you’ll get a run of good luck. Open enough free boosters, and you’ll get a streak of duplicates so long you’ll cry.
Random.
Never received a Mythic from free boosters, but have acquired several rares. Priest of the Blood Rite, Pia and Kiran Nalaar, and a couple colorless ‘dual lands’. I have really been hoping for Grip of Desolation for the last few weeks. Would work well with my black deck so I have been getting BFZ Fat Packs when I have enough crystals.
Well, in my experience Deathcap Cultivator and Inexorable Blob drop about as often as commons…
Didn’t get any of those ever 
But got like 5 Priests of the Blood Rite already. It’s a good card but c’mon…
I have gotten two mythics from free boosters, I believe. Of course, I’m obsessive about opening the free boosters at every opportunity.
got a mirror pool n a forsaken shrine from the same free booster yesterday.
my first copy of both cards.
The RNG Goddess is smiling in my direction. 
if only we are allowed to trade. I have an excess of 4 mythic Drana.
never got any priest yet. 
Pulled a Days Undoing from a free booster today. 
First mythic I’ve ever gotten from the free booster.
I too got one, but mine is sir of stagnation
at least now I’m only 10 points away from being in platinum with both red and blue.(I’m already platinum with red)
I’ve pulled more mythics from freebie boosters than I have from regular packs. I wish they would bring back the rune (free) boosters though. Even if they cost more than 250 a booster. Once you have your PW leveled, runes are the most useless game dynamic
QB grinder problems 
QB Grinding and the fact that I’ve been playing since this games early release so I had nothing to spend runes on aside from the rune packs. When they implemented the duplicate conversions, I over half a million runes gained from the first conversion.