A Goblin permanent card is an artifact, creature, land, and/or enchantment card with the creature type "Goblin". Usually such cards will be creatures in addition to any other types, but they may be kindred instead. For example, you could put Boggart Shenanigans onto the battlefield with this effect.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.