Remove all your opponents' threats and win the long game with one big finisher or by drawing more cards than your opponent
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In the wider realm of Magic, Cephalid Snitch is a 1/1 creature with no abilities 99.99% of the time, and enables you to two-for-one yourself by removing protection from black from a creature (presumably followed by a removal spell) the other 0.01% of the time
What sets Darkstar Augur apart is the fact that it flies, and for four mana total, creates two of that same card draw effect thanks to offspring, pressuring players to find two removal spells or a sweeper rather than the usual one-for-one trade a Dark Confidant might elicit
Green has good creature cards, so it makes sense to lean into that
While much of the bad of Unglued is only really identifiable in hindsight, the set was popular at its debut, and Rosewater immediately started work on a follow-up