That reason is often enchantment-based ramp like Wild Growth and Utopia Sprawl that produce extra mana from one land, letting this produce an absurd 4 mana rather than a respectable 2
While this is basically as easy to kill as a Baneslayer Angel it is not so much of an issue for the cards performance
The real beauty comes when you consider the right mix of different cards you want in an Atraxa deck (planeswalkers, instants, sorceries, battles, and more) to ensure that your Atraxa is drawing at least three to four cards consistently
its about creating access to the entire MTG universe, offering options for every player from the casual to the competitive, and ensuring that playing Magic remains an exciting, affordable, and inclusive experience
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Disciple is also a pretty useless one drop and tends to do nothing until the late game