Murktide Regent

“Delve <em>(Each card you exile from your graveyard while casting this spell pays for 1.)</em> <br>Flying <br>Murktide Regent enters the battlefield with a +1/+1 counter on it for each instant and sorcery card exiled with it. <br>Whenever an instant or sorcery card leaves your graveyard, put a +1/+1 counter on Murktide Regent.”