Yagyu Munenori, Heaven's Saber

First strike
{4}: each other creatures get -1/0 until the end of
turn. Yagyu Munenori, Heaven's Saber gets +1/0
for each creature affected until the end of turn.
(If a creature already has zero power, this ability
does not affect them.)
"Swords into Plows."
-Yagyu Munenori, Heaven's Saber