The Exploding House

(Gain the next level as a sorcery to add its ability.)
When this Class enters, create two tapped Treasure tokens.

{1}{r}: Level 2
Treasures you control have "{t}, Sacrifice this artifact: Add two mana of any one color."

{4}{r}: Level 3
Whenever you cast a spell, if mana from a Treasure was spent to cast it, this Class deals damage equal to that spell's mana value to each opponent.