During either player's turn, when a card or effect that would inflict damage to you is activated: You can activate this effect; you cannot Special Summon monsters for the rest of this turn, except 'Entermage' monsters, also Special Summon this card from your hand, and if you do, make that effect damage 0. If Summoned this way, banish this card when it leaves the field. If this card is Normal or Special Summoned: Inflict 500 damage to both players.