Quote Originally Posted by halfgodz View Post
Can you break Lion's Eye Diamond for mana, and then use the mana to cast a spell before discarding your hand?

i.e break LED to cast Cruel Bargain or Infernal Contract from your hand.
No, you must discard your entire hand to add 3 mana of any color. So, you can cast any spell card that was in your hand before breaking led. Usually you break led in response to empty the warrens or infernal tutor in order to use the mana for the wished / tutored spell.

GC.