Double tutors, even restricted ones, can smooth out gameplans and set up combos
Solve the Equation: Directly add an instant or sorcery card of your choice to your hand
I like the idea of using Lazotep Sliver, Basal Sliver, Staff of Domination, and whatever other Slivers you can use to fill out the curve to combo
On the other hand, you get to play this at the end of your opponent's turn (so you might as well get the card immediately), and you can get literally any card in your deck on the spot
Once again, this is all thanks to that pesky randomness that really threatens to spoil the fun
Supervillain Rumble Archenemy also has an alternate format for a four-player free-for-all Supervillain Rumble, where everyone uses a scheme deck and each player is considered an Archenemy