Siege Warfare

Whenever a source you control deal damage to
an opponent, that player discard a card. if they
can't, that player mill two cards.
"Day 137 of the siege; Supplies are running low, the
archers have run out of arrows and the commander
still hasn't regained consciousness. Outside the wall
the invaders are preparing for another push. I fear
that i won live to see another day."
— Siege of Avoli, Journal of an unknown soldier.