this.expansionSetCode = "ONS";
// {tap}: Add {1} to your mana pool.
this.addAbility(new ColorlessManaAbility());
// {R}{G}, {tap}: Choose target Beast creature you control and target creature an opponent controls. Those creatures fight each other.
Effect effect = new FightTargetsEffect();
effect.setText("Choose target Beast creature you control and target creature an opponent controls. Those creatures fight each other");
Ability ability = new SimpleActivatedAbility(Zone.BATTLEFIELD, effect, new ManaCostsImpl("{R}{G}"));
ability.addCost(new TapSourceCost());
Target target1 = new TargetCreaturePermanent(filter1);
ability.addTarget(target1);
Target target2 = new TargetCreaturePermanent(filter2);