Loxodon Partisan

Battle cry (Whenever this creature attacks, each other attacking creature gets +1/+0 until end of turn.)

Boros Reckoner

Whenever Boros Reckoner is dealt damage, it deals that much damage to any target.
{R/W}: Boros Reckoner gains first strike until end of turn.

Battalion — Whenever Boros Elite and at least two other creatures attack, Boros Elite gets +2/+2 until end of turn.

When Hunted Witness dies, create a 1/1 white Soldier creature token with lifelink.

Flying
War Falcon can't attack unless you control a Knight or a Soldier.

First strike
Mentor (Whenever this creature attacks, put a +1/+1 counter on target attacking creature with lesser power.)

When Doomed Traveler dies, create a 1/1 white Spirit creature token with flying.

Exile target creature. Its controller gains life equal to its power.

When Loyal Sentry blocks a creature, destroy that creature and Loyal Sentry.

Vigilance
Trusty Companion can't attack alone.

Create three 1/1 white Soldier creature tokens.

Extort (Whenever you cast a spell, you may pay {W/B}. If you do, each opponent loses 1 life and you gain that much life.)

Create two 1/1 colorless Myr artifact creature tokens.

Enchant creature
Enchanted creature can't attack or block.

Target creature gets +2/+2 and gains flying until end of turn. You gain 2 life.