Lullmage's Dominance XUUU
This spell costs 3 less if you target a creature whose controller has eight or more cards in their graveyard.
Gain control of target creature with converted mana cost X. "A spell to calm the Roil, another to suppress the will. The principles are the same."
Here's the usual Entrancing Melody effect, but with a mill rider. They're really pushing the milling subtheme.