What happens if I have 2 copies of Uberdragon Jabaha in the battle zone?
Each Uberdragon Jabaha gives the other one “power attacker +2000.” The power bonuses add up, so each of your other fire creatures gets “power attacker +4000” since they get +2000 from each Uberdragon Jabaha. If you had a third or fourth Uberdragon Jabaha in the battle zone, your creatures would get even bigger!