Against any deck trying to be the control player throwing threats of many different forms, man lands, direct damage, planeswalkers, dorks, equipment, artifacts etc is optimal as it makes it less likely they will have the appropriate thing to deal with the threat at the time it is required
Though sprout has the potential to grow by exiling creature cards, you'll almost never want to exile your own for obvious reasons
But its initial cost-effectiveness allows you to draw cards whenever opponents cast noncreature spells, unless they pay four extra mana
Anyone who has played with Goblin Chainwhirler in the last year will be familiar with the notion that playing even a handful of non-red sources in your deck with that card can have dire consequences, but that principle is even more pronounced for Ayara and her black sources since casting her is much better on the third turn of the game than on any other
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My favorite detail is how the hemispheres on both cards are designed slightly different from each other when they absolutely did not need to be