Mindleech Mass is a rare Creature — Horror card from Ravnica Remastered (RVR), collector number 375. Current market price: $0.37 (foil $0.43), TCGplayer market prices via Scryfall.
Trample Whenever this creature deals combat damage to a player, you may look at that player's hand. If you do, you may cast a spell from among those cards without paying its mana cost.