Perhaps the Willowdusk has many black spells that involve paying life for effects, which would be typical for black mana
Sorcery speed is definitely a restriction, but having the ability to copy a target five times when youve got the mana even if the discount is only one mana, saving on having to untap Orthion four times is a great
During a battle involving your "Mikanko" monster, your opponent cannot activate effects until the end of the Damage Step
You might also think about Massacre Girl leading a deck with a Vampire sub-theme so that you can play Patron of the Vein and not worry about opponents creatures coming backunless you also want to play Rise of the Dark Realms instead
Kumongous, the Sticky String Kaiju , Dogoran, the Mad Flame Kaiju , Radian, the Multidimensional Kaiju and Kurikara Divincarnate are also EARTH, FIRE, DARK Attribute monster