Selective Breeding

{g}, Tap an untapped Human you control, Sacrifice a non-Human creature: Search your library for a creature card with converted mana cost equal to one plus the sacrificed creature's converted mana cost that shares a creature type with it, put that card onto the battlefield, then shuffle your library. Activate this ability only
any time you could cast a sorcery.
"Are your gigantolilies in need of pollination? Then I have just the thing for you!"