A:AB$ Pump | Cost$ 1 G T | ValidTgts$ Creature.YouCtrl | TgtPrompt$ Choose target creature you control | SubAbility$ TrackerFight | StackDescription$ None | SpellDescription$ Target creature you control fights another target creature.
SVar:TrackerFight:DB$ Fight | Defined$ ParentTarget | ValidTgts$ Creature | TargetUnique$ True | TgtPrompt$ Choose target creature to fight the first target