Roderika, Spirit Tuner

When Roderika, Spirit Tuner enters, exile up to
three creature cards from any graveyard. For each
card exiled this way create a 1/1 white Spirit creature
token with flying.

Whenever a creature you control enters the
graveyard, it becomes a spirit in addition to its
other types.

{2}{w}{u}: Sacrifice target spirit and return another
target spirit from your graveyard.