Krevnon's Duel

Pay 10 Rage Mana while casting this
enchantment, otherwise sacrifice it when it leaves
the stack.
Whenever another source adds Rage Mana to
your reserves, add one Rage Mana to your
reserves for each creature you control.
Krevnon was taking it easy on the human he was fighting, yet the human refused to put up a good fight
to make it worth his time.