Joust

Choose target creature you control and target creature you don't control. The creature you control gets +2/+1 until end of turn if it's a Knight. Then those creatures fight each other. (Each deals damage equal to its power to the other.)

Venerable Knight

When Venerable Knight dies, put a +1/+1 counter on target Knight you control.

Worthy Knight

Whenever you cast a Knight spell, create a 1/1 white Human creature token.

Gallant Cavalry

Vigilance (Attacking doesn't cause this creature to tap.)
When Gallant Cavalry enters the battlefield, create a 2/2 white Knight creature token with vigilance.