Superhero Crystal of Power

Equip {2} Can only equip to a superhero

Whenever equipped superhero uses an ability
that has X mana in it, X is twice what you pay
as X for the purpose of determining the abilities affect. When equipped superhero dies,
all other superheroes you control get +1/+1.
"I want you to learn to use this crystal, not
impale yourself."—Han Sh'nara, wizard trainer