Rattagast, the Deranged

When Rattagast, the Deranged comes into play.
create four 1/1 green squirrel creature tokens.
When Rattagast, the Deranged leaves play,
search your library for a squirrel creature card
and put it into play then shuffle your library.
All squirrel creatures you control get +1/+1.
It's like he speaks to them....