MScore: 3.9/10
Lullmage's Domination
Sorceryuncommon
This spell costs 
less to cast if it targets a creature whose controller has eight or more cards in their graveyard.
Gain control of target creature with mana value X.
"One spell to quiet the Roil, one to quash the will. The principle is the same."
Illustrated by Zezhou Chen · Zendikar Rising · #66
Rulings for Lullmage's Domination
5
2020-09-25
To cast Lullmage's Domination, choose a value of X, choose a creature with the appropriate mana value, then determine the spell's cost, subtracting {3} if appropriate. This can't reduce the {U}{U}{U} in the spell's cost. For example, if you wish to target a creature with mana value 2 whose controller has eight cards in their graveyard, you'll pay {U}{U}{U}.
2020-09-25
If a creature on the battlefield has {X} in its mana cost, X is considered to be 0.
2020-09-25
Once Lullmage's Domination resolves, the control effect lasts until the creature leaves the battlefield or you lose the game. It doesn't expire at the end of turn.
2020-09-25
An ability that offers a bonus if an opponent has eight or more cards in their graveyard won't provide additional benefits if more than one opponent has eight or more cards in their graveyard. There are also no additional benefits no matter how many cards are in an opponent's graveyard, as long as there are at least eight.
2020-09-25
In a multiplayer game, once an opponent leaves the game, they won't be considered for such an effect, no matter how many cards they had in their graveyard before leaving the game.
less to cast if it targets a permanent with mana value 1.
less to cast if you control a creature with flying.