Since it doesnt have to tap to activate, you get (you guessed it!) infinite mana with something that taps for more than 3 mana, like Chromatic Orrery or Timeless Lotus
Ace, Fearless Rebel Alexander Clamilton Amrou Scout Amrou Seekers Ashe, Princess of Dalmasca Avalanche of Sector 7 Aven Riftwatcher Ballista Squad Banon, the Returners' Leader Barret Wallace Barret, Avalanche Leader Big Game Hunter Blade of the Sixth Pride Blightspeaker Bound in Silence Children of Korlis Cho-Arrim Bruiser Cho-Manno, Revolutionary Deepcavern Imp Defiant Falcon Defiant Vanguard Deserter's Disciple Dunerider Outlaw Errant Doomsayers Firion, Wild Rose Warrior Flesh Duplicate Freedom Fighter Recruit Fresh Volunteers Jeong Jeong's Deserters Jeong Jeong, the Deserter Jet, Freedom Fighter Jet, Rebel Leader Jhovall Queen Jhovall Rider Jor Kadeen, First Goldwarden Knight of the Holy Nimbus Lawbringer Leonin Lightbringer Lightbringer Lin Sivvi, Defiant Hero Longshot, Rebel Bowman Lyse Hext Mercenary Informer Mighty Mutanimals Neyali, Suns' Vanguard Nightwind Glider Old Hob, Alleycat Blues Outrider en-Kor Oxidda Finisher Pious Warrior Pipsqueak, Rebel Strongarm Punk Frogs Ramosian Captain Ramosian Commander Ramosian Lieutenant Ramosian Revivalist Ramosian Sergeant Ramosian Sky Marshal Rappelling Scouts Rathi Trapper Rebel Informer Resistance Skywarden Reveille Squad Rhuk, Hexgold Nabber Riftmarked Knight Rinoa Heartilly Rinoa, Angel Wing Sally Pride, Lioness Leader Saltfield Recluse Samite Censer-Bearer Shield Dancer Skyshroud Poacher
Memnarch is a commander who allows you to repeatedly steal your opponent's cards
Whether The Master Multiplied stays at such a high price remains to be seen
