Modern Horizons 2
Creature — Dragon
Delve (Each card you exile from your graveyard while casting this spell pays for .)
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.