It steals attack steps
If Gobland gains flash, or you have the ability to play Gobland as though it had flash (due to Teferi, Druid of Argoth, for example), you can ignore the normal timing rules for when during your turn you can play a land, but not any other restrictions
You can goad three different players' boards or just focus on one especially scary army, remove other players blockers, or return a valuable instant or sorcery from your graveyard to your hand
Even when your opponent has a removal spell waiting, they'll probably end up sacrificing something before they can kill this formidable threat
There are few things in Magic: The Gathering more intimidating than facing down a card you just cant stop
Both Violent Outburst and Shardless Agent are the backbone of every Cascade deck being played in Modern nowadays, and currently there are two tier 1 decks (Living End, Crashing Footfalls) cascading into powerful spells to win the game