Ayunda Risu, Nonstop Nuts

Cumulative upkeep—Create a Nut. (It's an
artifact with vanishing 2 and "When you sacrifice
this artifact, if it had no time counters on it, search
your library for a Forest card, put that card into your
hand, then shuffle your library.")
Landfall - Whenever a land enters the
battlefield under your control, create a 1/1 green Squirrel creature token.