Jace, the Mind Sculptor Jace, the Mind Sculptor is the blue planeswalker epitome of card advantage
This opens the door to repeatedly copying Creatures with powerful enters-the-battlefield or attack triggers, generating more cards, removal, mana, or combat pressure turn after turn
Karumonix, the Rat King commands this deck full of Magic's most vile vermin
These cards can apply plenty of pressure, and dish out some big damage
This can be very strong on its own because it means that opposing players will have to discard some of their cards if Kefka is left unattended, and the user can discard valuable combo pieces in order to later retrieve them with the Commander staple called Underworld Breach, particularly if comboed with Lion's Eye Diamond to create infinite mana and then win the game