// Geothermal Crevice enters the battlefield tapped.
this.addAbility(new EntersBattlefieldTappedAbility());
// {tap}: Add {R} to your mana pool.
this.addAbility(new RedManaAbility());
// {tap}, Sacrifice Geothermal Crevice: Add {B}{G} to your mana pool.
Ability ability = new SimpleManaAbility(Zone.BATTLEFIELD, new BasicManaEffect(new Mana(0, 1, 0, 0, 1, 0, 0)), new TapSourceCost());
ability.addCost(new SacrificeSourceCost());
this.addAbility(ability);
}