Creature - Trifling Citizen
UUU, Tap Family Historian - Search your library for a creature card that has the same superclass as one of your other creature cards on the battlefield, reveal it to your opponent, then place it on the top of your deck. (A superclass is for example a Trifling, Human, Elf, Demon, Beast etc.)
"I know nothing of my parents, save that I lost them at a very young age. But you don't have that problem, do you? Lets see what your legacy is!"