I have in play Jughernaut of Khorne and seeking unit cost with 0 to put in play and attack. Can I trigger the JoK's action for free which says?
"Action: When this unit attacks, sacrifice X developments to search the top five cards of your deck for a unit with printed cost X or lower and put it into your battlefield, attacking. Then, shuffle your deck."
Is that correct wouldn't sacrifice development, look the top five cards of my deck for a unit with 0 printed cost, then play this way in my battlefilde?