Goblin Expeditionist

{w}, sacrifice a creature: Prevent the next X
damage that would be dealt to Goblin Expeditionist this turn, where X is equal to the toughness of the sacrificed creature.
{r}, sacrifice a creature: Deal X damage to target blocking creature, where X is equal to the power
of the sacrificed creature.

"Remember, you are the shield, and the other
guy is the catapult."