Kymora, Mistress of the Depths

{5}{u}{u}: Gain control of target creature.
At the beginning of your upkeep, scry X
where X is the number of instant and
sorcery cards in your graveyard. If X is 3 or more, draw a card. (Look at the top X cards of your library, then put any number of them on
the bottom of your library and the rest on top in
any order.)