In a dedicated artifacts deck, if Edgar, King of Figaro comes down and draws you three or four cards, its absolutely busted
Again, this could be a common by todays standards, but creatures have come a long way
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Discovering once per turn on any dino entering the battlefield is a nutty amount of card advantage, kind of like a Gishath that splits the value up over time instead of all at once
It already has the ability itself, so it can come down and start doing work immediately, and then it hands a big pile of keywords, including haste, to your other spiders at the beginning of combat on your turn
She has 2 Strength, 4 Willpower and 2 points of Lore too