Alchemist's Talent (BLC 22)

Enchantment — Class • Mana cost: {3}{R} • Bloomburrow Commander • Rare

(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.

Illustrated by Milivoj Ćeran.