While the others may affect the board in more significant ways, since a card can represent various threats at various times, drawing or discarding simply has more of an effect than even more seemingly powerful effects like dealing one AOE damage to your opponents board
Grab Your Sword is similar, albeit pricier, due to the fact that it lets you deal two damage to each opposing character in one fell swoop
On the flip side, you can also use Proliferate to get multiple chapters in the same turn, which can also be quite powerful
A little extra space in a box is fine
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A stax deck's primary strategy is locking other players out of game with control spells or creating a unbeatable prison that the opponents can't escape