Even flavorful cards like Spider Manifestation and Twitching Doll serve a dual purpose: They provide mana early on while adding to your overall spider count
For less than the cost of a single booster pack, you can secure a playset of a card that generates massive board value and demands an immediate response from your opponent, or they will quickly be overwhelmed by the constant recursion of threats
Only finding cards with flashback or disturb makes it fairly narrow, but I can see a casual deck built around flickering it as a draw engine to find cards like Mirrorhall Mimic and Deep Analysis
Avatar: The Last Airbender - Earthbending Winner: Badgermole CubBadgermole Cub Runner-up: Toph, the First MetalbenderToph, the First Metalbender Out of all the Avatar abilities, this is the one that seems most powerful right out of the gate
You probably want to cheat it out, but itll be problematic if you can find the right engine
Stack It Up The stack is where instants truly shine