Skink Dartblower

Enchant target creature.
When enchanting target creature, play this card
face down so opponents cannot see it. When enchanted creature is blocked, reveal Skink Dartblower before applying damage.
When Skink Dartblower is revealed, destroy
blocking creature as if applying deathtouch.
Skink Dartblower is no longer an enchantment
and becomes a 1/1 green Lizard creature.