Seppa, Nature's Guardian

Whenever one or more creatures enter the
battlefield under your control, you may search
your library for a land card, reveal it, and put
it into your hand, then shuffle your library.
Whenever a land you control is put into your
graveyard from the battlefield, you may search
your library for a creature with converted mana
cost X or less, reveal it, and put it into your
hand, where X is the number of land cards in
your graveyard, then shuffle your library.