Jillian, Priest of Krevnon

Whenever a creature deals combat damage to a
battle, planeswalker, or player, add Rage Mana to
your reserves equal to the damage dealt to that
target.
X Rage Mana: Destroy all other creatures with
mana value X. Activate only once per turn.
{1}{w}{w}: Create a 1/1 white Soldier creature token
with First strike.