Kael’thas’s Final Gambit

Sacrifice any number of creatures. For each creature sacrificed this way, add {x}, where X is that creature’s power. Use this mana only to cast spells with {x} in their cost or to activate abilities of legendary creatures.

If Kael’thas is on the battlefield or in your command zone, deal X damage to all creatures.

“One last chance to set it all ablaze.”