Gaea's Blessing
Sorcery
Target player shuffles up to three target cards from their graveyard into their library.
Draw a card.
When this card is put into your graveyard from your library, shuffle your graveyard into your library.
Rebecca Guay
Rulings
If Gaea's Blessing has no legal target cards in a graveyard, either because its targets became illegal or because you didn't choose any, the target player shuffles their library.
(wotc • 2018-04-27)
If an effect puts multiple cards from your library into your graveyard at once, put all of those cards there before Gaea's Blessing shuffles your graveyard into your library.
(wotc • 2018-04-27)
Rulings
If Gaea's Blessing has no legal target cards in a graveyard, either because its targets became illegal or because you didn't choose any, the target player shuffles their library.
(wotc • 2018-04-27)
If an effect puts multiple cards from your library into your graveyard at once, put all of those cards there before Gaea's Blessing shuffles your graveyard into your library.
(wotc • 2018-04-27)