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Effects that nab only one card arent really what youre looking for in terms of card draw, unless they have other uses, and anything that draws one card for 4 or more mana is too weak for this list, with rare exceptions

This means you can use pump spells to boost its stats after the opponent declares blockers, so that you can ensure you get in for damage and draw a plethora of cards

Most decks still want to do a fair bit of summoning from the deck and Extra Deck, and getting additional draws off of those summons can make or break your turn

It feels awesome

This is probably the least important point on the list, but you also ideally want the box to look and feel nice if it fits all the other criteria