If only your opponent controls a monster, or you control an EARTH monster, you can Normal Summon this card without Tributing. If this card is Normal or Special Summoned: You can Special Summon 1 Level 5 EARTH Warrior monster from your hand. You can only use this effect of Tenma the Sky Star once per turn. Once per turn, when your opponent activates a card or effect that targets a Warrior monster(s) you control (Quick Effect): You can make this card lose exactly 500 ATK, and if you do, negate the activation, and if you do that, destroy that card.