Explosive derailment bug or cheating?
I just witnessed an individual cast explosive derailment twice for 2 mana instead of 3. I wasn't recording video sadly but I have pictures of the board state after losing. Am I missing something here that would cause an anomaly like this to happen? Either I am missing something or it is blatant cheating. The first instance there were two untapped lands and it was cast on a creature for 4 damage and the second instance my opponent had 1 untapped land and a treasure token using the same effect to kill another creature for 4 damage. It is my understanding with spree that you would need 1 mana for the cost of the card and then two more mana to activate the card's effects. Am I overlooking something here? Judge?