Revolutionist is a common Creature — Human Wizard card from Modern Horizons 2 (MH2), collector number 139. Current market price: $0.24 (foil $0.38), TCGplayer market prices via Scryfall.
When this creature enters, return target instant or sorcery card from your graveyard to your hand. Madness {3}{R} (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)