Blue has it unconditionally, black lets you trade life for it, green often bases it on your creatures, and red has you discard cards in exchange for a draw, but white has almost nothing
They ultimately do much the same thing in this archetype but Elder does it more conveniently, appropriately and better
Even outside of triggering our payoffs, having a bunch of card draw is pretty powerful, letting us dig through our deck for removal and threats and making it super hard to flood out since, if we happen to draw too many lands, we can always discard them to Thirst for Discovery or Tainted Indulgence
Similarly, if a spell is cast without paying its mana cost, but the player did pay mana for additional costs such as from kicker or from Thorn of Amethyst, Vexing Bauble's first ability won't trigger and won't counter that spell