Momentum Breaker is a uncommon Enchantment card from Aetherdrift (DFT), collector number 97. Current market price: $0.28 (foil $0.35), TCGplayer market prices via Scryfall.
Start your engines! (If you have no speed, it starts at 1. It increases once on each of your turns when an opponent loses life. Max speed is 4.) When this enchantment enters, each opponent sacrifices a creature or Vehicle of their choice. Each opponent who can't discards a card. {2}, Sacrifice this enchantment: You gain life equal to your speed.