Murktide Regent

Delve (Each card you exile from your graveyard
while casting this spell pays for {1}.)
Flying

Murktide Regent enters the battlefield with a +1/+1 counter on it for each instant and sorcery card exiled
with it.

Whenever an instant or sorcery card leaves your graveyard, put a +1/+1 counter on Murktide Regent.