Zack and Rachel, Maniacal Duo

Deathtouch, lifelink.
{2}{b}: Sacrifice a Creature to Zack's scythe.
{2}{w}{t}: Return 2 creatures from the graveyard sacrificed to Zack's scythe to the battlefield. Rachel stitches them into one creature with power and toughness equal to the sum of the power and toughness of each creature with the abilities of both.