Non-random matchmaking in draft
In Arena premium draft and cube draft, you're disproportionately likely to be matched against decks with similar colours/archetypes. I think it's possible this effect is even more pronounced for your first match, but I'm less certain. (It may also be true for other draft formats.)
I speculate that this is a bug arising from a matchmaking algorithm which is intended to make players of similar strengths or decks with similar win records be preferentially matched against each other.
(To see this effect in action, e.g. draft a two-colour deck CD, and pay record the colour pairs of two-colour decks you play against. Repeat this drafting a different colour pairing -- ideally one that you never played against first time around.)

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NicoS2411#61600 commented
Hi,
I just played a Kahldeim draft where I faced three consecutive opponents that dropped Dragonkin Berserker within the first three turns, while I failed to draw any of my 5 removals at each game.
What is the probability, in a real draft, to face three consecutive opponents that opened the very same rare card, and that magically happen to have it all in their starting hand (while you couldn't draw anything to counter it in 6-7 turns each game (ie 3x15 = 45 cards drawn)).
The probability is very slim. However, your algorythm decided I would face this card, just like it decides, 1 times out of 3 game, to give me 2 or 3 identical cards in my starting had.
I hate the fact you clearly manipulate the matchmaking/draws/coin tosses in ranked and non-ranked games, thousands of people have already reported this issue, but that's not the point here.
I'm more questioning the morality/legality to do it in a draft, which cost real money to enter. I mean, imagine if a poker website was doing the same and was manipulating the cards to force the results it wants... ethical ? certainly not. Legal ? Doubt it.
This is what Arena is doing. Instead of insulting you like many, so i will merely suggest to implement a FULL RANDOM MODE for those who want...