Aurora, the Battle Strategist

Whenever you cast a Battle card, Aurora, the
Battle Strategist gets +1/+1 until end of turn.
Whenever a Battle card is put into your
graveyard from anywhere, you may pay 1
life. If you do, return that card to your hand.
"War is not won by brute force alone. It
requires strategy, cunning, and a willingness
to make sacrifices."