Slick Imitator Slick Imitator gets exciting once you're up to max speed, then the measly to copy a spell has a ton of potential
You can use it as a sort of protective spell by responding to an opponents removal spell and copying the creature they attempt to kill, or surprise a creature like Niv-Mizzet, Parun in combat to trade
Second, it helps thin your deck
Set: Dragon's Maze Printing: Foil Increase: +$16.90 Current Market Price: $34.77 The nonfoil version of Hidden Strings still goes for less than 50 cents, but listings for the foil version have depleted to the point that the lowest listing at time of writing is $66.77
You can also suspend it yourself for two mana, getting to get all that mana on your fifth turn more often than not
The set was made up of 83 total cards, including the widely popular Dark Charizard