Loam Explorers

Whenever two or more creature cards are put into
your graveyard from anywhere, another target creature you control explores. (Reveal the top card
of your library. Put that card into your hand if it's a
land. Otherwise, put a +1/+1 counter on that creature,
then put the card back on top or into your graveyard.)
{2}{b}, {t}: Put the top four cards of your library
into your graveyard, then you may return a land
from your graveyard to your hand.