A good starting hand will give you plenty of Seven Dwarfs to play that will all benefit each other to help you control the board or gain an early lore advantage, depending on your matchup
Yes, occasionally youll get multiple Void Rend, but thats a lot of mana to pay for something that has a really limited restriction on what it can copy
And, because this deck will get lots of lands in play and draw lots of extra Birds, getting one or more Storm Crows each turn isnt going to be difficult
If the mana cost were any higher, then spells that weren't Crashing Footfalls would be Cascaded up, and the deck's strategy would fall apart
or destroy target permanent if it's red
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