It means that this card serves quite well as a commander, because of Commander Damage, but youll need to be able to defend them to get the most out of them
If you have a mana source, an untap effect, and a tap effect that eventually ends the game, Gogo can get you the win
It can protect anything be it Enchantment, Creature or even Planeswalker (though it wont stop combat damage)
It can really turn people off, and even if its a fair tactic to a certain extent, it will make you enemies
So, you can use in-person options
This is usually enough damage for game: just 2 2/2 creatures plus Craterhoof Behemoth (haste, remember) already adds up to 18 trample damage enough to finish off a slightly-damaged opponent