After thinking about it for some time I think we should save the discord from vagman's deck instead of the dragon. The reason for that is while Dragon and Abominations have served us well, at the end of the day they're just random beaters which can be replaced by creatures from other elements. For example in the Gravity rainbow, replace Pillars with Novas and Aboms with rainbow creatures. In duos, play more pendulums and creatures from the secondary element. Discords however are irreplaceable.