Mage Knight Dual Color Cards Expansion
Mage Knight: Dual Color Cards Expansion features the five new cards that were introduced in Mage Knight!
Four of the cards are dual colored:
Rush of Adrenaline
Power of Crystals
Each of these cards allow you to spend either type of mana shown on the card in order to play them or activate their stronger effect. They also count as both colors for certain effects.
The fifth card is a new artifact, the Mysterious Box.