March from the Black Gate (Showcase Scrolls) (LTR-545) - The Lord of the Rings: Tales of Middle-earth: (Showcase)

When this enchantment enters and whenever an Army you control attacks, amass Orcs 1. (Put a +1/+1 counter on an Army you control. It's also an Orc. If you don't control an Army, create a 0/0 black Orc Army creature token first.)