Rot Fang, Bane of the Nile

Swampwalk
Crocodile creatures you control have Consume (Whenever a creature under your control leaves the battlefield, if that creature had greater power or
toughness than this creature, put a +1/+1 counter on
this creature.)
{b/g}{u/b}, Sacrifice a creature: Search your library
for a land card with a basic land type, put it onto
the battlefield tapped, then shuffle.