Drawing cards is one of the best things you can do in Magic, and there isnt a more flexible draw spell
But in an attempt to compensate, they can once again draw a card at the beginning of their turn
About which packs to buy, actually it does not matter that much since the probability of getting what you want is low, but, to maximize it, Id recommend getting Amonkhet for Hazoret the Fervent, Glorybringer, Ahn-Crop Crasher, Magma Spray and Sunscorched Desert
That's two - very strong, and on colorless we should be able to drop artifacts, but more limited
The sparkly fish also has Aqua Return , which acts as a get-out-of-jail-free card, dealing 120 damage before popping back into the deck with all its attached cards