Warded Battlements

Defender (This creature can't attack.)
Attacking creatures you control get +1/+0.

Inspiring Captain

When Inspiring Captain enters, creatures you control get +1/+1 until end of turn.

Enchant creature
Enchanted creature gets +2/+2, has first strike, and is a Knight in addition to its other types. (It deals combat damage before creatures without first strike.)

Legion's Judgment

Destroy target creature with power 4 or greater.

Cavalry Drillmaster

When Cavalry Drillmaster enters, target creature gets +2/+0 and gains first strike until end of turn. (It deals combat damage before creatures without first strike.)

Plains

Inspired Charge

Creatures you control get +2/+1 until end of turn.

Oreskos Swiftclaw

Defiant Strike

Target creature gets +1/+0 until end of turn.
Draw a card.

Raise the Alarm

Create two 1/1 white Soldier creature tokens.