Blue Sun's Zenithcard_draw$4.59Very close functional reprint for scalable instant-speed card draw targeting any player, with the added upside of shuffling back into your library.
Pull from Tomorrowcard_draw$1.98Similar scalable instant card draw in blue that draws X cards and keeps the same general role as a mana sink for instant-speed refueling.
Braingeysercard_draw$80.89Classic source of variable large card draw to a target player, matching the same basic effect and mana-sink profile.
Mind Springcard_draw$0.54Straightforward X-based card draw spell with the same core function of converting extra mana into cards, though it only targets you.
Whispers of the Musecard_draw$0.28A blue scalable draw spell that can function as repeatable card advantage or a larger one-shot draw spell, overlapping as a mana sink.
Sphinx's Revelationcard_draw$1.10Another X-based blue card draw finisher that scales with mana and provides a huge burst of cards, with extra life gain as a bonus.
Commander's Sphereutility$0.24Not a direct draw spell, but in blue-heavy control decks it serves a similar resource-refill role as a scalable value piece, especially in Commander.
Dig Through Timecard_draw$0.40Efficient blue card-advantage spell that can dig deeply for multiple cards, serving a similar late-game refill role at a much lower mana cost.