Gaea's Eld Guard

Defender
When Gaea's Eld Guard enter the battlefield,
shuffle one target card from your graveyard
into your library.
When Gaea's Eld Guard is put into your
graveyard from your library or hand,
shuffle your graveyard into your library.
"Ages pass and my sword endures, but who is graced
to wield it and and how changes" - Gaea