Dragonborn Oathbreaker

First strike
Dragonborn Oathbreaker costs {1} less to
cast for each 1 life your opponents have
lost this turn.
Smite - Whenever Dragonborn Oathbreaker
attack you may pay {b}{r} and discard a card,
if you do Dragonborn Oathbreaker gets +X/+0
and gains trample until end of turn, where X
is 2 + the mana value of the card discarded.