Guild House Cat

Syndicate - 2 {2}{b} (You may pay an additional
{2}{b} as you cast this creature spell. If you do, search
your library and/or graveyard for a creature card
with converted mana cost 2 or less that shares a
creature type with this creature, and put it onto the
battlefield tapped. If you search your library this way,
shuffle it.)
Whenever one or more creatures an opponent
controls dies, you gain 3 life and draw a card.