The card comes into play early and puts a stop to players trying to ramp with mana rocks, Treasure, or what have you
If, during a player's declare attackers step, a creature that player controls that's been goaded is tapped, is affected by a spell or ability that says it can't attack, or hasn't been under that player's control continuously since the turn began (and doesn't have haste), then it doesn't attack
Heres a breakdown of where you can find each series of special treatments: Premium Treatments Neon Glow and Gold Chocobos
Card advantage over your opponents offers more options and flexibility and can even win you the game
With how many Human Token generators and cheap, powerful Humans there are in the format, Heronblade Elite is a must-run in any Human deck that can play green
There are a handful of instants and sorceries with abilities that get better with landfall, but the mechanic mostly appears on enchantments and creatures