Effect
When this card declares an attack, it gains 500 ATK. If this card on the field is destroyed and sent to the Graveyard: You can Special Summon 1 Level 1 monster with 0 ATK and DEF from your Deck. Its effects are negated, also it is destroyed during your next End Phase.
The monster effect "This card's ATK increases by 500 each time this card declares an attack" is a Continuous Effect.
It is applied immediately each time "Decayed Dog" declares an attack, and its ATK increases by 500. Furthermore, the ATK increased by this monster effect remains applied as long as "Decayed Dog" remains face-up in the Monster Zone.
The monster effect "If this card on the field is destroyed and sent to the Graveyard: You can Special Summon 1 Level 1 monster with 0 ATK and 0 DEF from your Deck. The effect of the monster Special Summoned by this effect is negated, and it is destroyed during your next End Phase" is a Trigger Effect that activates in the Graveyard. (It does not target. It can also be activated during the Damage Step.)
The process of "it is destroyed during your next End Phase" does not create a Chain Link.
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