As Rick, Steadfast Leader enters the battlefield, choose two abilities from among
first strike (This creature deals combat damage before creatures without first strike.),
vigilance (Attacking doesn't cause this creature to tap.), and
lifelink (Damage dealt by the creature also causes its controller to gain that much life.).
Humans you control have each of the chosen abilities.
As long as you control four or more Humans, Humans you control get +2/+2.