SUDA-JP023 叛逆者エト Liberator Etho
Level 8 DARK Reptile Special Summon Effect Monster
ATK 4000
DEF 0
Cannot be Normal Summoned/Set. Must be Special Summoned (from your hand or GY) by paying half your LP while your opponent has a Monster Card on their field or in their GY with an effect that can activate in the hand and/or Monster Zone, but activates in response to the activation of a card or effect to do so. You can only Special Summon “Liberator Etho” once per turn this way.
(1) This card’s Special Summon cannot be negated.
(2) This card in the Monster Zone cannot be used as material for a Fusion, Synchro, Xyz, or Link Summon, also it is unaffected by monster effects activated on your opponent’s field during your turn only.

Note, to explain this card:

This card looks at every monster card in your opponent’s Graveyard, and that they control on their field, including their spell/trap zones, and typically checks their text for the word “When”. If one of those monsters can be activated in the hand or on the field ‘when’ a card would activate itself or its effect, it meets the conditions for this card, and you can summon it from your hand or Graveyard by paying half your life points. Here are some example text strings:

• When a card or effect is activated
• When a monster effect is activated
• When your opponent activates a card or effect
• When your opponent activates a monster effect
• When an opponent’s monster activates its effect
• When an opponent’s card activates its effect
• When you activate a card or effect
• When you activate a monster effect
• When your monster activates its effect
• When your card activates its effect

There are also some MANDATORY “If” trigger conditions like those found on Doomcalibur Knight, Gogogo Golem – Golden Form, and Light and Darkness Dragonlord. These 3 also would work for this new card.