Darkblade Agent isnt alone in playing in this level 2 design spaceThoughtbound Phantasm is a similar design, but with less flavor (I guess the more ideas you gather, the more powerful or actualized this thought-eating spirit gets?)
Basically, they are vulnerable to attacks when exhausted
You can challenge your opponent and eliminate (banish) their cards that are in play to limit their opportunities to gain points
Printed in the heady days of the FIRE Design power creep, you get a card which combines aggressively-costed stats with maybe the best draw-related activation this side of Griselbrand and Razaketh
Time for a draft, time in a match, and length of a match
The moment WotC announces an inkling of an intention of removing the reserved list, there will almost definitely be collectors suing the company