As Greymond, Avacyn's Stalwart enters, choose two abilities from among first strike, vigilance, and lifelink.
Humans you control have each of the chosen abilities.
As long as you control four or more Humans, Humans you control get +2/+2.
Greymond is a mono-white Human tribal anthem on a stick: flood the board with Human creatures, hit four or more to turn on the +2/+2 buff, and grant two keywords (typically vigilance + lifelink or first strike) to swing for lethal while staying safe. You curve out cheap Humans, deploy a lord-heavy board, and use white's go-wide payoffs and protection to crash in.
Built-in anthem that scales aggressively once you have four Humans
Keyword flexibility (vigilance/lifelink/first strike) lets you adapt to threats and gain life while attacking
Mono-white tribal has deep, cheap Human support and efficient creatures
Lifelink + wide boards stabilize against aggro and grind out value
Mono-white means weak card advantage and ramp without specific build choices
Heavy reliance on the commander and lords makes you vulnerable to board wipes
Going wide is punished by sweepers; rebuilding is slow in white
Lacks reach/evasion outside keywords, so stalled boards can be a problem