I've been looking at cards that might share a similar mechanic to
Impulse that are already in Manalink.
I will start looking again.
Impulse, or something similar, is really important as the ability to be able to put cards at the bottom of your library accelerate the deck tremendously. Using what I use in it's place now,
Index, is a decent card but you get stuck with whatever cards you looked at as the next few you will draw, all be it in whatever order you chose!
Being able to cycle out cards you don't need at a given time to try and root out the one(s) you do make
Impulse very attractive, especially to a combo deck like ProsBloom!