Blitz (If you cast this spell for its blitz cost, it gains haste and "When this creature dies, draw a card." Sacrifice it at the beginning of the next end step.)
on its back, it's a board in a can, a mass pumping effect, and a somewhat one-sided board clear
So long as you have reliable ways to get the desired cards back out of your graveyard after milling them, building decks around these effects allows you to dig much faster hence the prevalence of graveyard recursion in combos like Thassas Oracle
It can come from anywhere - your hand, the battlefield, your library, or even from exile if you can figure out a way to do that
Is Storm Crow always better than the other cards
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