Spirits of Mischief

Spirits of Mischief is not a creature if there are
no creatures in any graveyard.
Spirits of Mischief has power and toughness
equal to the number of creatures in all graveyards.
When an opponent attacks their creatures have
base power 1
When you attack you may pay {2}, opponents creatures have base toughness 1
"The ancestors are not pleased... Or are simply bored." — Anthlek Biline