Dragonblooded Knight

|Dragonblooded Knight|???|????|Warrior/Effect|Earth|4||0|1300|This card on the field is also treated as a Dragon-Type monster. At the start of the Damage Step, when this card attack or is attacked: Target 1 Dragon-Type monster you control; this card gains ATK equal to its ATK until the end of the Damage Step but the targeted monster cannot attack this turn. When this card attacks: You can discard 1 card; this card can attack your opponent directly but when it uses this effect any Battle Damage it inflicts to your opponent is halved. If this card is destroyed by battle and a monster was targeted by this card's effect: Destroy that monster.|

So, it can be a filter for direct attacks of other dragons at the cost of half-damage?

You can put it that way.