We need to know more about the duel, like what other cards are on the field, and were you dueling Vagabond or not.
Also, you did try to click on the Extra Deck, right?
This ability is dumb imo. You add 2 of a tuner that specializes in summoning even-Leveled Synchros and then it gives you Black Rose: a Sync-7. Has anyone been able to come up with anything that makes this ability somewhat coherent?