// Target creature you control gets +1/+0 until end of turn. It fights target creature you don't control.
Effect effect = new BoostTargetEffect(1,0,Duration.EndOfTurn);
effect.setApplyEffectsAfter();
this.getSpellAbility().addEffect(effect);
this.getSpellAbility().addTarget(new TargetControlledCreaturePermanent());
effect = new FightTargetsEffect();
effect.setText("It fights target creature you don't control");
this.getSpellAbility().addEffect(effect);
Target target = new TargetCreaturePermanent(filter);