You could just add a buffing unit to each wave.Note: Older dispels are being left as is untill I replace/upgrade those spells completely, this is primarilly for talents and probably the items. Existing dispel skills are planned to be remade in order to make them have utility that isn't dependant on what skills your opponents pick and if they decide to use them or not
Discuss or whatever it is what you people do on this forum.