Great Goblin, Foul-Hearted

If you don't control an Army, the Goblin Army token you create enters the battlefield as a 0/0 creature before receiving counters. Any abilities that trigger when a creature with a certain power enters the battlefield, such as that of Mentor of the Meek, will see the token enter as a 0/0 creature before it gets +1/+1 counters.

Some spells and abilities that amass Goblins may require targets. If each target chosen is an illegal target as that spell or ability tries to resolve, it won't resolve. You won't amass Goblins.

Some cards refer to the "amassed Army." That means the Army creature you chose to receive counters, even if no counters were placed on it for some reason.