Gaakt, the Tricky War-Chief

When an Orc Deals combat damage to an
opponent that player discards a card, if they have
no cards to discard they mill their deck instead.
War-Chief (Creatures with War-Chief Challenge
other creatures with War-Chief on your side of the
battlefield. The creature with the greater power and/or
toughness kills the other and gains the abilities and power
and toughness of the other War-Chief)