Olav, Merry-Wanderer

This spell costs {1} less for each land card in
your graveyard.
At the beginning of your upkeep, reveal the top
card of your library. It it's a creature, you gain 2
life. If it's a land, you may put it into your hand
or graveyard. If it's anything else, put it back on
top.
As long as there are four or more lands in your
graveyard Olav gets +1/+1 and lifelink.