I had thought crusaders were an OK card.
Then, I discovered their synergy with flying weapon.
You may not know this, but the endow ability, if used on a flying weapon (weapon creature), will always take the attack of the creature, even if that creature has been buffed.
Anyways, I was messing around in the trainer, and I had a flying vampire dagger, that I had used a blessing on, to get to 9 attack. Then, I used sky-blitz doubling the attack of the flying weapon (airborne).
I endowed it while it was flying, and the crusader gained 20 attack and the vampire ability. I slapped an immaterial on it, and the match was easy.