Nanobody, The Rescuer

Defender
Sacrifice any number of proteins : choose X
creature cards from your graveyard where X is
the number of sacrificed creatures and divide
them in two piles. An opponent chooses one pile
at random then put all the creatures chosen this
way onto the battlefield. Those creatures gain
haste, sacrifice them at the end of your turn.
Exile the other pile. (Activate only as a sorcery.)