If this discard is viewed as a non-cost, Compulsive Research and Thirst for Knowledge come in at a cool, efficient 1.5 mana per card, which is below our 2-mana-per-card threshold
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These are the best Sacrifice outlets in Magic: The Gathering: 1
It also strips out many lands from your deck, and over a few turns, it dramatically reduces your chances of drawing a land, thus increasing card quality from the rest of your deck
For one mana we can sacrifice Cindervines, destroy target artifact or enchantment and then deal 2 damage to that permanent's controller
So its natural that card draw is considered one of the most important aspects of any deck and in my humble opinion the most important of all