Anne, Mother of beavers

Beavers you control get +1+1.
Whenever a beaver enters the battlefield under your control,
draw a card.
{g}{u}: create a 5/5 legendary beaver token named Eleanor.
{g}{g}{u}: create a 13/13 legendary beaver token named William.
If you control William and Eleanor, search yours library for a card named Michael, father of beavers.