Rituel
Créez un jeton de créature 0/0 verte Limon avec le piétinement. Mettez X marqueurs +1/+1 sur lui, X étant deux plus le nombre total de cartes qui sont des limons ou qui sont appelées Boue contre l'humanité que vous possédez en exil et dans votre cimetière.
Un deck peut contenir n'importe quel nombre de cartes appelées Boue contre l'humanité.
The last ability of Slime Against Humanity lets you ignore the "four-of" rule. It doesn't let you ignore format legality. For example, during a Murders at Karlov Manor Limited event, you can't add Slime Against Humanity from your personal collection.
If you own face-down cards in exile, they won't count toward the value of X, even if you're allowed to look at them and you know they are Ooze cards or cards named Slime Against Humanity.
The last ability of Slime Against Humanity also lets you ignore the "singleton" rule in formats like Commander.
Slime Against Humanity isn't put into your graveyard until after it finishes resolving, so it doesn't count itself for its own effect.