While I was gathering 10,000 skeletons... I usually gathered a maximum of 5,000, but my opponent already had 25 Champions of the Dungeon. :)
And those griffins were neutral – therefore, without artifacts. Griffins have this feature: they fly up, and you wait for the beast to come down. There were no other creatures in that battle besides the griffins. Imagine the scene: an army of one color stands on the right, and there's nothing else. :) What do you do?