Confounding Conundrum is a rare Enchantment card from Zendikar Rising (ZNR), collector number 326. Current market price: $0.54 (foil $0.72), TCGplayer market prices via Scryfall.
When this enchantment enters, draw a card. Whenever a land an opponent controls enters, if that player had another land enter the battlefield under their control this turn, they return a land they control to its owner's hand.