i used heliods intervention with valkira out to target 3 of opponents artifacts, i saved ONE mana because the card says you need to pay ONE mana extra when you target .. then the game demanded i pay TWO mana, note: it didnt demand THREE mana.. it demanded two mana and i could not pay two mana so the whole card fizzled out. regardless of how the card is supposed to work, theres no reason on earth for it to demand TWO mana, two total not two more .. the card is written like **** to begin with, very unclear and ambigious.. as far as i can tell, the card should of only demanded ONE extra mana, not one for each target, it may be targeting several things but its only coming from ONE spell .. either way it certainly had no reason to demand two mana extra when targeting three things, which tells me the card is just not only written like **** but thoroughly bugged!