You're talking specifically about unilateral draw, right? I mean, we added Loom of Fate and Crystal Shards and did not change them once, as far as I can remember. Both can be good sources of cards for you.
When it comes to unilateral draw, we are looking out for situations where the game could be too luck-based and one-sided and we deal with those in the spirit of giving both players an opportunity to have their skills play a part in the game. If a unilateral engine can be played early, we want it to cost you some tempo, which gives the opponent a chance to actually do something. We really do not like games being won quickly on autopilot with a helpless opponent on the other side of the table. Hope that helps!
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