This sometimes can result in you getting stuck for a few turns if you need an extra land that you know isnt coming
Sylvan Library Speaking of multi-format staples, Sylvan Library can even make the cut in Vintage, besides being often seen in cEDH
Channeler Initiate Channeler Initiate is a mana dork that adds mana of any color, and it has three uses
However, it is important to mention that you are not really gaining any tempo from this trade, since when you take a card from your opponent's hand, they are never spending their mana to cast it (unlike a Counterspell, for example, which has a weird Time Walk effect on the opponent, since you not only stop the spell but also force your opponent to spend mana attempting to cast it)
Theres a good chance combo decks would only get better with more tutor options at their disposal, too