Eyn, Murkwater Seer

Whenever you cast an instant or sorcery, scry X
where X is the mana value of the spell.
Whenever you scry X or more cards, put X
Omen counters on Eyn.
Remove X Omen counters from Eyn: Exile a
nonland permanent from your graveyard with manavalue X or less. Put that card into your
hand at the end of the turn.