Double Trouble was added in Beta 42.0 as a replacement for Aaron's Secret during the Bravery rework. As of season 63, this card has been replaced by Rage. But description of this, now belongs to spell Reload
When used, you will draw a monster with Haste from your deck, as well as one with Turbo. The latter makes this a great addition to a Turbo deck with the likes of Toriel's Car and Dress Lion. Dress Lion can function as a replacement for the also changed Penetration, or be used alongside it for a great number of Silence cards.