Card Rulings:Elemental HERO Terra Firma

OCG Rulings

 * Tributing an "Elemental HERO" monster is a cost to activate the ATK-boosting effect.
 * The ATK-boosting effect can be activated multiple times in the same turn.
 * The ATK-boosting effect can be ended at any timing during the End Phase.
 * If the effect of "Elemental HERO Terra Firma" is activated by Tributing a face-up "Elemental HERO" monster you control that is equipped with "United We Stand", the ATK increase is equal to that monster's increased ATK on the field rather than its original ATK.