Dralnu, Sorcerer-King

Whenever you cast an instant or sorcery spell, you may sacrifice another creature with toughness equal or greater than the spell's converted mana cost. If you do, copy that spell. You may choose new targets for the copy.
Sacrifice any number of creatures with total toughness 7 or greater: Return Dralnu, Sorcerer-King from your graveyard to the battlefield.
"No matter the time, my reign stays eternal."