Sphinx's Decree

When this enchantment enters, exile target creature an opponent controls with mana value 3 or less. When this enchantment leaves the battlefield, target opponent creates a 3/3 green Dinosaur creature token with trample.

When this creature enters, exile target creature an opponent controls until this creature leaves the battlefield. Whenever this creature attacks, target Vampire gets +X/+X until end of turn, where X is the power of the exiled card.

Exile target creature with power greater than or equal to your life total.

Choose one — • Destroy target Vampire. • Destroy target enchantment.

Destroy target attacking or blocking creature.

Prevent all combat damage that would be dealt to this creature.

Flying

This creature doesn't untap during your untap step. Whenever you gain life, untap this creature.