Staff of Nincard_draw$0.82Both are colorless artifacts that provide repeatable card advantage from the battlefield. Staff of Nin is easier to use and also pings creatures or players, though it draws only one card per turn.
Loreseeker's Stonecard_drawBudget$0.09Like Tower of Fortunes, this is a colorless artifact built to turn excess mana into cards. It draws fewer cards per activation, but it comes down for the same mana cost and serves the same long-game role.
Mazemind Tomecard_draw$0.26Both are colorless artifacts that generate incremental card advantage over time. Mazemind Tome is much more efficient and provides selection and life gain instead of a big burst draw.
Memory Jarcard_draw$33.98Both artifacts are used to convert mana into a large card influx. Memory Jar is a one-shot effect rather than repeatable, but it delivers a similar burst-draw role at a higher power level.
Mind's Eyecard_draw$4.63Both are colorless mana sinks that create card advantage in long games. Mind's Eye can draw many more cards over time, especially in multiplayer, though it is slower to start.
Skullclampcard_draw$4.74Both are artifact-based ways to convert resources into cards. Skullclamp is vastly cheaper and more efficient, but it requires creatures to function rather than mana activation.
Tome of Legendscard_draw$0.32This artifact repeatedly turns combat presence into extra cards, filling a similar utility slot as a colorless card-advantage engine. It is cheaper and easier to leverage in aggressive decks.
Well of Knowledgecard_draw$6.12Like Tower of Fortunes, this is a colorless artifact that trades mana for cards. It can draw multiple cards over a game and is especially strong in low-curve or mana-rich decks.