A Condition (called Rule Effect (ルール効果, Rūru Kōka) in the OCG) is an unofficial term for effect requirements for Effect Monsters.

There are two main types of Conditions: Conditions that are not considered to be an effect, which cannot be negated by cards like "Skill Drain"; and "Effects without classification", monster effects that are similar to Continuous Effects, but are applied universally just like the other main type of Conditions, and can be negated by cards like "Skill Drain".

"Conditions that cannot be negated"

These are unofficially referred to as "True Conditions" or just "Conditions" and are officially referred to as "This is not an effect" conditions.

"Conditions that can be negated"

Officially these are referred to as "This effect has no classification" effects, or simply referred to as Unclassified Effects.

They are similar to Continuous Monster Effects as they do not activate (start a chain) when they are applied, so cards that negate activations like "Divine Wrath" and "Debunk" cannot be used against them. However unlike Continuous Monster Effects they can be applied while the card is not face-up on the field, such as in the hand and Graveyard, or in the case of the "Multiple Tributers", while face-down on the field as well.

If "Dark Ruler Ha Des" destroys "Grapha, Dragon Lord of Dark World" by battle, "Grapha" cannot use its Special Summoning Procedure to Special Summon itself from the Graveyard.

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