The first two, Planechase and Archenemy , were Wizards' own creations, eventually drawing on casual formats from the game's own community (Chaos Magic, for example, was clearly an inspiration for Planechase)
Basalt Monolith Basalt Monolith is a fiddly untapping artifact that can give you a burst of mana, though its more commonly used for evil
Faithless Looting, Cathartic Reunion and Shriekhorn fill your graveyard with dredgers and payoff cards and dredge those cards once your yard is full
As illustrated by ConceptLab, this card is more than just a piece of cardboard for many
Either way, a 2/2 for three that can bounce any dork when it comes into play is great although not quite great enough for two copies with the three slot being a very contested slot for blue guys