Syr Kieron, Siegebreaker

Knights you control have "Valiant— Whenever this creature becomes the target of a spell or ability you control for the first time each turn, it gains your choice of deathtouch, first strike, or lifelink until end of turn."

At the beginning of combat on your turn, you may pay {r/w}. If you paid {r} attacking Knights you control gain +2/+0 until end of turn. If you paid {w}, attacking knights you control gain +0/+2 until end of turn.

"Wall and will alike will break before me"