Lux, Magus Queen

: As an additional cost to this card, sacrifice Luxanna Crownguard. If you do, transfer loyalty counters from Luxanna Crownguard to this card.
+2: Convert one mana of any color to 2 mana of any other color.
-7: Spend all your availiable mana: Deal X damage to target player or planeswalker, X equal to your mana spent.