Greed's Gambit (8) [The Big Score]

When this enchantment enters, you draw three cards, gain 6 life, and create three 2/1 black Bat creature tokens with flying. At the beginning of your end step, you discard a card, lose 2 life, and sacrifice a creature. When this enchantment leaves the battlefield, you discard three cards, lose 6 life, and sacrifice three creatures.