Luisman, Phyrexian Taxonomist

Toxic 1 (Players dealt combat damage by this creature
also get a poison counter.)
When you proliferate, return Luisman, Phyrexian Taxonomist from your graveyard to your hand.
{g}, {t}, Discard a creature card: Search your library
for a creature card, reveal it, put it into your hand,
then shuffle.