The Bloodbile Swarm
{3}{B}{R}Legendary Creature — Elemental Insect
Ward—Sacrifice a Blood artifact. Other creatures are Blood artifacts in addition to their other types and have "{1}, {T}, Discard a card, Sacrifice this creature: Draw a card." Whenever a player sacrifices a nontoken creature or discards a creature card, exile it. It perpetually gains prismatic. You may cast it until the end of your next turn.